I have just sat up a 55 gal tank and I am very green. My small children liked the looks of a lot of the community fish, so we ended up setting up the tank with these types of fish. I personally like the cichlids, but I know that most cichlids are very aggressive towards other less aggressive fish. The last thing i want to do is put introduce a fish that will start eating my kids fish for lunch. Any recommendations for cichlid types or am I just SOL?