Fish tank bioload calculator

Plan your community setup by calculating biological load. Our guide flags overstocking, minimum tank conflicts, and schooling size issues.

Neon tetra in a freshwater aquariumPanda corydoras on aquarium substrateHoney Gourami
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Overstocked or incompatible

Bioload score22.5
Capacity20
Load113%
Warnings1
  • tank too small: Estimated bioload is 113% of the conservative capacity.

See this actual stocking plan visually

Transfers your existing tank capacity and group counts only when they fit the visual planner limits (2–500 US gal, up to six unique species, 1–40 each). Otherwise a new example opens.

Continue planning · 4 related tools

Related tools

Fish Compatibility CheckerCheck behavior, size, water, and pair-specific conflict rules.Tank Setup GeneratorTurn stocking limits into practical freshwater setup ideas.Algae Eater FinderFind cleanup crew options that fit the tank and livestock.Visual Aquarium PlannerPlan a whole community, compare group sizes and water overlap, and inspect explainable compatibility warnings.

Observed photo context

Observed aquarium photo examples

These photos show observed aquarium setups for the selected species. They are useful context, but they do not change the compatibility result or replace tank-size, temperament, group-size, and water-parameter checks.

Betta, Corydoras catfish, and Mystery Snail in a planted Betta community aquarium
Real-world aquarium photo showing a Betta observed with Corydoras catfish and a Mystery Snail in a planted setup.Betta aquarium context for visual reference only.
neon tetra in a freshwater aquarium
Neon tetra in a freshwater aquarium.Species photo context for visual reference only.
panda corydoras in a freshwater aquarium
Panda corydoras on aquarium substrate.Species photo context for visual reference only.

What this tool does

This planner uses bioload scores to estimate how many fish your tank can support. It ensures you meet minimum group sizes and identifies if your species share compatible water parameter ranges.