I've been thinking of starting an African cichlid tank but i'm not sure what to put in there. I have a standard 75 gallon tank with a xp3 and pengiun hob filter. I have neutral water with ph of 7 so i know i'm going to have to make some changes to raise the ph level and hardness of the water. I'll start by adding either aragonite or crushed coral mixed with pool filter sand as substrate. I was also thinking of adding limestone as my rockwork. One of my questions is what else would I have to add to the water to raise ph and hardness of the water? Another question is what to stock it with? I like the look of male eye biters (Dimidiochromis compressiceps) what would be good tankmates for this species if I only got one?