Get a Huge Tank

Marine fish

179 saltwater species are in the planner. The checks work for them, but a marine tank asks more of you than the numbers show.

Before you start

Salt water is less stable than fresh. Small tanks swing quickly in temperature and salinity, so the planner holds marine stock to a more cautious footing and never mixes it with freshwater species. Many reef fish are wild-caught, and some do poorly in captivity: check each page, and buy from sources that can say where the fish came from.

Salinity is measured as specific gravity, and the Water verdict needs a shared range. Equipment sizing for marine stock raises the filter flow figure, see heater, filter and light. The rules are on the method page.

All marine species