I have a cycled 55 gallon setup right now that im planning on putting mixed africans in and i keep hearing that a slight overcrowing enviroment is benificial as it will make them less aggressive...well, how many is a good number for a 55 gallon? Keep in mind these fish will probably spend there entire lives in this tank so take into account for them eventually being full sized. Thanks alot! Also, is there any plants with a lower lighting requirement that they wont destroy?