My wife is inheriting an 80 gal tank for her 2nd grade classroom. The tank has a leak, but my in-laws own a glass company (big blessing) and will professionally repair it for free. My wife and I both think that when we stock the tank, we should put some rather interesting creatures in there for her second graders. She likes the idea of some "aggressive, pretty fish that would be fund to watch" (cichllids), a pleco, as well as some interesting "critters" such as frogs, crayfish snails, crabs, clams, etc. We are also considering putting in something like angels or other interesting fish instead of cichlids. Obviously, we can't put everything in there, so we are exploring our options and looking for suggestions. What do you think would be fun and interesting in an 80 gal tank for 2nd grade children? BTW, we want to avoid guppies or goldfish.