I have a 37 gallon that has 2 mollies, 2 platies, and a Mystery Snail. My roommate will take the four fish, and the snail can be moved to another tank if needbe. I want this to be a more of a single tank. Either one big fish or a pair. And that's it. I've thought about either a Parrot Cichlid or maybe a couple of Figure 8 puffer fish. I've been advised against the Parrot. But I'm open to other options. I like colorful active fish. No Angelfish. Everyone says Angelfish, and they aren't interesting to me.