About FishAuthority

FishAuthority builds practical, honest tools for freshwater aquarium keepers — starting with a stocking calculator that respects the biology instead of repeating the discredited "one inch per gallon" myth.

Our calculators weigh each species' adult size, waste output, schooling needs, temperament, and water parameters so you can plan a tank your fish will actually thrive in. Everything is free. Where we recommend gear, we use affiliate links (see our disclosure) — it never changes your price and never changes our advice.

Aquarium care is nuanced and species vary; always cross-check important decisions with reputable care sheets and cycle your tank before adding livestock.