Of course, if you add fish into the equation, you enter a whole new territory of variables. Best consult your local pet store on overcrowding. Filtration and Cleaning Cleaning an aquarium tanks is basically the same for frogs as it is for most freshwater fish, except it tends to be required more stringently because frogs shed more often. There are numerous filter devices available on the market. Ask your pet dealer for advice on these.
Gold fish eat the skin.
Cleaning your tank also falls under the same categories as proper care of fish. In the best case scenario, you'll be filling the tank with stale water when you clean it. By this I mean, water that has been sitting out for at least 24 hours, AND has been dechlorinated. That way you are less likely to poison the frogs during regular maintenance. I'm not saying add the water to the tank and then treat it, but if you should find the frogs acting sick after a tank cleaning, try treating the water, or better yet, transfer them to a temporary holding container with treated water in it while you treat the water in their tank again.