Planning tools

Check stocking before you buy

Use these free tools with our species pages and guides. They are planning aids — always verify with water tests and species-specific care.

Stocking calculator

Rough bioload planning by tank size and adult length. Not a substitute for filtration, maintenance, or species research.

Tank Size (gallons)

Experience Level

Conservative stocking for beginners

0.0"Total Fish Length

20.0"Recommended Max

0%Stocking Level

Quick temperament and pairing warnings for a short list of species. Confirm details on each care profile before stocking.

Click on fish to add them to your tank