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Accessories

Tank divider

accessory

Used for: Breeding tanks, Tank maintenance

Description

A tank divider splits one tank into two compartments that share the same water. Published work uses it for three different reasons, and they are worth separating because they need different dividers. The first is keeping animals apart while keeping the water common. A 2025 transmission experiment set up 38 L glass tanks with a tank divider whose hole diameter was 1 mm, to prevent predation and allow only water circulation between both sides. One tank, one filter, one temperature, two populations that cannot reach each other. The second is what the animals can see. A 2024 zebrafish study recorded behaviour for 5 min when the divider was opaque and not visible to each other, then for 5 min when the divider was transparent and visible to each other, and measured how the fish responded. Whether a divider is clear or solid is not a detail; it decides whether the two sides are socially isolated or merely physically separated. Breeding setups use that on purpose: in a 2018 zebrafish study a male and a female placed in the same box were separated by means of a division plate overnight, and the next morning, when the light period started, the division plate was removed. The third use is handling. A 2025 paper on a delicate schooling fish reports building a tank divider that can be inserted onto a tank's existing internal standpipe and closed so that the fish are confined in an ever smaller proportion of the tank, which allowed the team to net fish even quicker without lowering the tank's water level and with little to no chasing. A divider can be a way to catch a fish without emptying its home. No source here publishes a thickness, a slot fitting or a mesh size for an aquarium divider beyond the 1 mm holes in that one experiment, so this page publishes none.

Sources

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