10 Best Aquarium Tank Divider of 2025

Tested and Reviewed: Top 10 Aquarium Tank Divider deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

CLarellara

Fish Tank Divider 75 Gallon Clear, Aquarium Divider, Isolation Board with Suction Cups

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Editor's bottom line:

“This aquarium tank divider is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Fish Tank Separator Size: 75 gallons fish tank, 17.28"*10"*0.157" *2 pic (43.9cm*25.4cm*4mm* 2), hole diameter: 0.2" (5mm), suitable for aquariums with a width of 18 inches, using laser cutting, the circumference and the hole are smooth, the aperture is well-designed to secure the safety of your fish. (Please measure your tank before purchasing!).
Product Material: Eco-friendly, non-toxic, high hardness, corrosion resistance, easy to clean; high transparent acrylic (PMMA), the light transmittance is more than 94%, the 4mm thickened plate can resist the impact of large fish.
Adjustable Fish Tank Divider: There are long holes around the divider, the height of the divider can be adjusted according to the size of the fish tank, suitable for 29 gal, 30 gal.(breeder), 40 gal.(breeder), 50 gal, 75 gal, 90 gal, 120 gallon aquarium; the bottom defecation tank is good for fish manure through; the hole spacing is dense, allowing water to flow more and more smoothly.
Complete Accessories: Including transparent suction cups*8, fixing clip*8, transparent screw*4, screwdriver*1; easy to install, no need to purchase additional accessories, and provide more for spares.
Safety Packaging: Acrylic fish tank isolation board, including accessories, are covered with protective films on both sides to prevent scratchesthe accessories are packaged separately, and the partition is wrapped with shock-absorbing materials for transportation protection purpose,If anything is missing or damaged in shipping please contact us. PSThe protective film on the acrylic board is transparent after being torn off. You can refer to the video for installation methods.

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Picked by 156 people today

9.5

SIKGFPN

SIKGFPN Acrylic Fish Tank Divider,10 Gallon Tank Divider,Adjustment Clear Fish Tank Separator Set with Suction Cups (10gal)

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Main Highlights

Adjustable Size: Designed for 10-gallon fish tanks, this fish divider features an adjustable width of 9.3'' to 10.5'' and a height of 11'', ensuring a perfect fit.
Premium Material: Crafted from durable, odorless acrylic, this partition is clear and transparent which looking great, and will stay clear for a long time after use
Easy Installation: Simply peel off the protective film from the acrylic surface, attach the two side brackets to the tank with suction cups, and insert the divider. Its quick to install, easy to remove, and hassle-free to clean.
Thoughtful Design: The gap between the bracket and the tank is tiny, ensures your fish stay securely on their side. With 4mm-diameter holes and a 4mm bottom slit, the divider promotes water flow and helps fish waste circulate away.
Secure Packaging: Each isolation board comes with protective film on both sides to prevent scratches during transit. Suction cups are individually packed.If you receive the goods are missing or damaged, please contact us!

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9.5

RA AquaTech

Acrylic Aquarium Divider Kit 5.5/10 / 20L / 20H / 29 / 40B / 55/75 / 125gal Fish Tank with Suction Cups (10gal)

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Main Highlights

For Aqueon tanks ONLY!!! It will not fit Marineland or any other brand's tanks! Don't try, it will NOT fit.
Dimension: 9.95 x11.5 inch
1 acrylic divider (4mm thick cast acrylic), 4 suction cup mounts
High quality silicone suction cups last a long time. If the suction cups age or don't stick, boiling them in hot water to restore the pliability, This will extend the lifespan of the suction cups
Please confirm your tank's brand and size before purchase to avoid unnecessary returns.

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9.2

Hoypeyfiy

Hoypeyfiy 8 Pieces Fish Tank Divider with Sucker Clips 30x30cm/11.8x11.8“ Aquarium Filter Bottom Divider Partition Separator

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Main Highlights

Useful tool: The fish tank divider is designed to be placed on the bottom of the tank and can separate fish and fish eggs. When place vertically, it can prevent differen kinds of fish from biting each others.
Easy to use: The tray is about 30x30cm/11.8x11.8x0.3 inches. The aquarium bottom divider tray allows you to use a scissor to trim it to meet your different needs.
8-in-1: There are 8 fish tank divider boards in one set, so you can use them to meet your different needs
Simple installation: The set contains suckers, so the aquarium bottom divider can be installed easily and quickly
Aquarium maintenance helper: The fish tank bottom divider can also make your easily clean the food residuals, feces and other crumbles on the bottom of the fish tank.

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9.0

Haiabei

8Pcs Plastic Mesh Canvas Sheets Embroidery Aquarium Fish Tank Divider Plastic Grid Isolation Board Partition Net Pane Separator Filter Bottom Tray,20 Pcs Binding Bars Sliding Bars ,Crochet Projects

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Main Highlights

What you get8Pcs Fish Tank Filter Bottom Isolate Grid Black(13.19*10.23") and 20 pcs Binding Bars Sliding Bars.You can easily divide your fish tank into several compartments with these divider holders for breeding or separation.
Safty MaterialAquarium Fish Tank Filter Bottom Isolation make by safe and environmental protection plastic,won't produce safe effect to aquatic animals box water quality.
Easy to UseEach Fish Tank Divider can be snapped together to make a large panel,the plastic mesh has a simple operation; First, you need to tailor the plastic mesh into the right size and shape, then put it in the right place, fixing it with a black sliding bar, you can get a nice decoration in this way; Simple methods can help you install quickly and save a lot of time
Great DesignThe grid divider can effectively separate fish and prevent them from biting each other.Separations of different fish for breeding.Increasing the survival rate of baby fish,isolating diseased fish and aggressive fish.
Widely Applicable It is a good fish tank divider and can also Suitable for various DIY craft projects,great for jewelry organizer boxes,tissue boxes, bags,bookmarks,3D models

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8.8

HingoFuni

HingoFuni Aquarium Fish Tank Divider Acrylic Isolation Grid Board with Suction Cups Included Clear Fish Separator Transparent Plate Baffle Cover Blocking Fish Partition Net 30x40cm/11.81x15.74in

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Main Highlights

Premium material: The fish tank partition is made of acrylic, which is sturdy and durable, you don't have to worry about it breaking when you use it. The fish drying separator has high light transmittance, which can clearly observe the situation in the water
Practical design: Our fish tank divider has two different holes, the long hole is to prevent fish and shrimp from running out, and the round hole is to let the water flow. Moreover, there is a manure gutter drain can make your water stay fresh
Wide application: This fish tank divider is very suitable for the fish farm and aquarium, which can raise different types of fish at the same time. And this fish tank divider effectively separate the fish and avoid bites each other
Easy to assemble: We will give you 8 suction cup, which can fix the divider with fish tank. Firstly, you should fasten suction cup to the screws of spacer plate. Secondly, you need suction cup on both sides of divider and fix them with screws
Warm tips: Please measure your fish tank before you buy it. Our divider fits 10 gallon fish tank

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8.6

Weramics

8pcs Fish Tank Divider with 10 pcs Suction Cups DIY Adjustable Aquarium Divider Filter Bottom Fish Tank Isolation Board Egg Crate

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Main Highlights

Product sizeaquarium divider separator kit includes 8pcs 11.8 Inch X 5 .9 Inch aquarium divider boards with 0.15Inch hole and 10pcs clips with suction.
Novel DIY designOur fish tank divider separate boad can be freely pieced together through concave convex buckles, and can be cut into the shape you want with scissors according to your tank needs.
Made of high quality materialsDurableSturdy, strong weighing capacity and not easy to be broken which can effectively prevent birds or cats from scratching fish
Product usage functionsThe aquarium board can be used as a fish tank isolation board. First, cut the board to the size you need, and then install aquarium divider with suction cup clips to separate the fish tank into multiple independent spaces, avoiding some fish from biting each other etc
Our aquarium board can also be used as Aquarium dividerTurtle basking platformAquarium lidAquarium stone base plateAquarium filter media bottom plateEgg crate and the bottom plate of the aquarium and so on

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8.3

Yes!Fresh

Acrylic Aquarium Fish Tank Divider Clear Kit Fit for All Type Aquarium Divider with Suction Cups (Kit A -1 PC 9.8"x11.8")

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Main Highlights

Compatible with Almost Any Shape of 10-950 Gallon Fish Tank with Suction Cups:Measure the inner width of the 2 points in your tank where you would like to divide the tank and the inside water level height, then choose the model and quantity of the divider kit fit for your tank . Our aquarium dividers are compatible with almost all types and all sizes of fish tank.
Non-decomposable,Easy to Clean and Works Long Time:Not like the mesh divider- a year some of them start disintegrating,falling apart and leaving holes,this fish tank divider is made with brocken-proof and firm & clear material which is durable and always keeps in a brand-new condition withouth too much maintainance.
Smaller Gaps on Either Sides Due to Small Screwable & Water Circulation Holes all over the Divider:The divider holes are very small which are only 4.2mm diamter, it allows water circulation,straws fixing and stop most of fishes from swimming through.Holes all around the divider pieces and make the widths and height of the assembling divider finely adjustable to achieve small gap between the tank sides.
Hyperelastic Material Creates Curvilinear Barrier without Suction Cups:The divider can be bent to form a unique curve barrier which will be stucked by fish tank sides instead of being fixed by suction cups . Kindly be reminded to screw & bend the divider pieces at the direction without some divider piece ends sticking up while bending, and never bend too much to avoid huge rebound.
No ToolsNo Techniques Needed & Easy Screws-tightening Assemly is a Must:You need to connect divider pieces yourself by tightening the secrews, it is easy and bare-handed job.Alwayse leave a very narrow gap between the divider and the wall of your tank if you don't want the small fish fry swimming through the gap.You can even tilt a little point of the divider to fix the tank wall when the connected divider is a little wider than the inner width of the tank.
Size:9.8''*11.8''. Please Measure the Size of the Fish Tank before Purchasing.

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8.1

KeaJuidy

2 Pack Fish Tank Divider with Suction Cup, Aquarium Divider Plastic Cuttable Grid Plate for Juvenile Fish Separator DIY Designed Clear Easy to Bent Cut and Assemble, 10x13in

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Main Highlights

The package includes 2 plastic mesh dividers and 12 suction cups for easy fixation and movement. There are enough suction cups for the separator to firmly hold the fish tank without falling.
Size: 10 * 13 inches/26 * 33 cm. Don't worry about whether it matches your aquarium. You can easily cut it to the size you want with scissors to fit your aquarium.
If you feel that the gap between the suction cup and the fish tank is too large and the fish can still pass through after installation, you can use scissors to cut two spaces before installing the suction cup.
Compared with other aquarium diaphragms, the hole of our diaphragms is very small, and the smallest fish cannot swim through, which improves the survival rate of young fish for breeding or separation.
You can easily divide the aquarium into multiple compartments using the divider. Effectively separate different fish and prevent them from influencing each other.The plastic grille can be cut and bent at will, and the suction cup can be fixed anywhere in the aquarium.

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8.1

Penn-Plax

PENN-PLAX Fish Tank Divider – Clear, Perforated Polymer Screen – 11 3/8” x 9 5/8” – Medium – Great for 10 Gallon Aquariums

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Main Highlights

MEDIUM FOR 10 GALLON TANKS: With our convenient Tank Dividers, theres no need to worry about getting a second tank to separate fry from parent fish, or to separate certain territorial or aggressive fish from the others! The medium size is perfect for 10 gallon aquariums, and measures 11 3/8 x 9 5/8.
CUT TO SIZE: In addition to being safe for both freshwater and saltwater tanks, the polymer screen can be trimmed to size. This will allow you to use the Tank Divider in smaller or non-standard sized aquariums. No other modifications needed.
CLEAR, PERFORATED SCREEN: Our Tank Dividers come standard with a clear, perforated screen thats put into place by two side clips. The screen is designed to not restrict water circulation, filtration, or heating. Its easy to install, and clean as needed!
HELPFUL ADVICE: For best placement and function, we suggest that the bottom is covered with sand, gravel, or your substrate of choice. This will better secure the divider into place, and ensure no little ones accidentally swim underneath or around the bottom corners.
SHOP PENN-PLAX FOR ALL YOUR PETS NEEDS: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.

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Our Best Overall Choice

Best Choice

9.7

CLarellara

Fish Tank Divider 75 Gallon Clear, Aquarium Divider, Isolation Board with Suction Cups

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Fish Tank Separator Size: 75 gallons fish tank, 17.28"*10"*0.157" *2 pic (43.9cm*25.4cm*4mm* 2), hole diameter: 0.2" (5mm), suitable for aquariums with a width of 18 inches, using laser cutting, the circumference and the hole are smooth, the aperture is well-designed to secure the safety of your fish. (Please measure your tank before purchasing!).
Product Material: Eco-friendly, non-toxic, high hardness, corrosion resistance, easy to clean; high transparent acrylic (PMMA), the light transmittance is more than 94%, the 4mm thickened plate can resist the impact of large fish.
Adjustable Fish Tank Divider: There are long holes around the divider, the height of the divider can be adjusted according to the size of the fish tank, suitable for 29 gal, 30 gal.(breeder), 40 gal.(breeder), 50 gal, 75 gal, 90 gal, 120 gallon aquarium; the bottom defecation tank is good for fish manure through; the hole spacing is dense, allowing water to flow more and more smoothly.
Complete Accessories: Including transparent suction cups*8, fixing clip*8, transparent screw*4, screwdriver*1; easy to install, no need to purchase additional accessories, and provide more for spares.
Safety Packaging: Acrylic fish tank isolation board, including accessories, are covered with protective films on both sides to prevent scratchesthe accessories are packaged separately, and the partition is wrapped with shock-absorbing materials for transportation protection purpose,If anything is missing or damaged in shipping please contact us. PSThe protective film on the acrylic board is transparent after being torn off. You can refer to the video for installation methods.

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