I have a 75 gallon tank. My water out of the tap is ph 8.2 with GH 13 and KH 17, which from everything I have read seems ideal for cichlids. I was thinking of a Mbuna tank with Yellow Tail Acei, Yellow Labs, and Red Zebras. Does this sound like it would work? I've heard that overstocking helps to keep down aggression, is this true? How many should I get? How many can I add at one time to a newly cycled tank? If I were to go with the fish I mentioned above, which ones should I start with? After the first group, how many can I add at one time? I welcome any and all advice. Thanks.