Hey pidge, welcome to ACF!!
Do you plan on breeding?
You could do some of the smaller species from Lake Malawi. Examples would be most Cynotilapia, Iodotropheus sprengerae, most Labidochromis, and some of the Pseudotropheus like polit or saulosi.
Should have good filtration, lots of rockwork for hiding places, and stock on the heavy side to help disperse aggression. Water pH is not that critical, but should be kept consistent anywhere in the range of 7-8.5. Can also add rift lake salt if desired.
Another option would be Lake Tanganyikan shell dwellers.
Check out this
Link which profiles the different species.
Let us know what interests you.