hi, im new to cichlids. i was wanting to set up a tanganikian tank, of dimensions 30"*15"*12", to house Altolamprologus calvus, neolamprologus brichardi , and julidochromis regani . i was wanting to se set it p with caves along the back, with villisnernia and some java moss and a course sand substrate. how many fish could this hold? would it be better to focus on one type of fish and get a shoal?if so which one and how many. if this is not possible what about if i pushed the boat out and got a 4' tank. how many of these fish could i house in that? would it be better to have shoals of 2 types rather than all three, or would it be better jsut to have a pair of each? cheers. sorry for the long windedness. ben