I read a frog book by Dick Barlett And he said that he lived in SW Florida and kept whites tree frogs outdoors. I made a screen enclosure 3' by 3' by 4' for my whites. according to Dick all he had to do was change water, the enclosure was self cleaning. When it rained it cleaned it. The most that could happen if there was no rain is you would have to hose it out. By being out side they'll get cooled down and possibly breed. plus there's enough room for lots of frogs. Lanny