I currently have a small 10 gallon tank, however; I'm looking to upgrade. I'm going for a vivarium type theme...all natural looking. I want to put different things in it, like fish I was going with Pictus catfish, some minnows, or guppies. I also plan to put an African Dwarf frog or two in it. that being said, I also want to put a crayfish in the tank too. it's a good 40-50 gallon tank. would that be okay with all of them, I really want them all to create a habitat almost like something you would see in a lake or pond...but I don't want to put them all in and that be asking for trouble...:/