It's not the size of the Acei that makes them need a 6' tank, it's their natural open swimming patterns/habits that designate the 6'. They would be ok in the 4' tank and you'd have no problems with aggression, but watching them swim in a 6' is awesome. The barely have enough room to get started in a 4' tank.
That's odd about your albinos. I've had more issues with the cobalt blues around here than with the albinos. Shame you're having so many problems, they really add something to the tank
I'm not saying your wrong i just disagree. I bet any mbuna in a 6 foot tank is a sight to see
I know what you mean about the albinos. I'm so frustrated because they look really nice in the tank. On the other hand my cobalts are doing great. I lost one to aggression in QT but otherwise they are healthy and eating great.