that`s a pretty good number especially if you wanted to breed them, but if your looking on adding a few species then you might wanna thin out the group....maybe leave 1 male to 4 females.....
Yes, it is white chiclid sand that costs about $25/20 lb bag. The "rocks" are a ceramic coral that you can get off Petsmart web page. They are very lightweight, but look real. I have 4 of them in the tank.
Nice steup i was thinking something the same with holey rock my new tank just came it is 4' so the rock for the tank will probably be more expensive than the amount i will spent on fish.