Hello all. I recently upgraded my 20 long to a 55. current stocking is 7 harlequin rasboras (will be 15 eventually), 7 peppered corys (will be 10-15 eventually) and two bolivian rams. I've been looking for a centerpiece for a while that is larger than the bolivians, peaceful and can do well in a tank kept around 74-75 degrees. I've stumbled on the keyhole cichlid which everything i've read says are peaceful, grows to 4-5 inches and can even live in groups regardless of sex. With this stocking how many do you all think I could do in my standard 55 gallon? I'm thinking 4-5. Let me know of your experience with these fish as well!