Fish, recally cool. Top feeders, bottom feeders, middle swimmers. I got so into it, I was able to successfully put 13 fish in a 30 gallon tank. Pictus catfish, loach, anyways, can be really entertaining if you know what to get. And how to mix fish. I got books, and went out. Feed them at same time. Blood worms. Turn of light at same time. There's all kinds of stuff. And no gold fish. Other fish can't handle there poop. To toxic. Anyways, good pets. Lot of work though.
Frogs and newts. African Dwarf frogs are like little frogs that are perhaps slightly larger than your finger nail and basically only swim around in water. Newts are awesome but can be poisonous, such as orange-bellied newts. Also~ be careful and make sure the newts cage is completely closed off. They are good at escaping.