Hello, I can help you with all three species. So a 20 long is good really for one toad. A 40 gallon is preferred for two but a 29 gallon can be made to work.

A leopard frog needs at least 3 feet of floor space a 60-40 land to water ratio is best but they tolerate other makes.

Fowler's toads live near moist environments according to the fish and boat commission of PA they are found along shorelines and streams. So a more moist climate is preferred by the Fowler's

Sent from my BLN-L24 using Tapatalk