I have a pair of kribs with a bn pleco and pearl gourami's in my 55 gallon. i want to get more fish in there. i have plenty of hiding spaces so i was thinking about getting rams. im probably getting a pair of blues. but i like smaller cichlids so could anyone give me any ideas. would shell dwellers work? aggasis? mcmasteri? panda? blue mbuna? opinions/ideas please, thanks in advance