Not only is the tank way to small, it is also not a good idea to house different amphibian species together. Each species should have its own enclosure. The reasoning for this is amphibians have porous skin that absorbs just about everything, while at the same time most also have skin toxins to protect themselves. By housing different species in the same enclosure you risk cross-contamination or the frogs poisoning each other.
I am assuming that you live in Florida (or somewhere close by), and you caught all these frogs yourself. By keeping species from different locales together you risk cross-infection. In other words, the frogs could be exchanging different pathogens with each other that they may not have any immunity for. By housing species from the same area the odds are less of this, however they don't negate the possibility of cross-infection.
Back to the over-crowding issue. Keeping that many frogs in that small space makes it hard to keep up with sanitary conditions, so you risk your frogs developing skin infections like "red-leg"
So please, seperate them in to species-specific enclosures as soon as possible. Thanks.

Also, welcome aboard.