hi, i have currently a 65 galllon tank with the same foot print as a 75 gallon tank. i have 4 malawi's in it now (2 Metriaclima lombardoi, Labidochromis caeruleus, and Albino Red-Top). my question is should add more malawi's or just keep it how it is? and by the way will my current fish work out in the long run? thanks