The compatibility database

117 records with the numbers that decide whether two living things can share a system: temperature, pH, hardness, light, humidity, adult size, and known conflicts. Every parameter a guide states comes from here. Free to browse, forever.

Or let the planner build it for you
41 Plants Aquatic, floating, pond, and vivarium plants with light, temperature, and water needs. Open → 34 Livestock Fish, shrimp, snails, amphibians, and reptiles, with parameters, size, and temperament. Open → 12 Microfauna Springtails, isopods, and the cleanup crews that turn waste back into soil and food. Open → 30 Gear Substrate, light, hardscape, and tools, honestly rated, with the cheaper-is-fine calls. Open →

How the compatibility read works

Two aquatic species can share water when their temperature, pH, and hardness ranges overlap. A betta wants 78 to 82 F; a white cloud minnow wants 60 to 72 F. Those ranges do not meet, so they do not belong in the same tank, whatever a store shelf suggests. The database stores each range, and the build planner checks the overlaps for you.

For land animals the same logic runs on temperature and humidity. A crested gecko tops out around 80 F; a dart frog wants humidity above 80 percent. Match the animal to the enclosure you can actually hold, not the other way around.