I'm getting a 50G tank, how many frogs can I have in there? Can I add any fish in there?

[mpmistr]

In my experience with keeping frogs and fish?

The frogs will hunt them and the fish will eventually get sloppy. Even if the fish is a fast moving top dwelling species, eventually the fish HAS to rest.. they go into a state of lethargy and just drift.. some times at the bottom of the tank. This is usually when X. Laevis 'cleans house'. So yeah.. I wouldn't really bother unless you want to feed your frogs fish of course.