A dark background and substrate will make them feel a bit more comfortable, but then again any color against a black backdrop will appear more vibrant (ex..Velvet Elvis painting). As far as the lava rock I'm not for sure either, but I don't think it will raise ph. It WILL scratch your fish up from it being so rough. You could get an algae eater to keep your holey rock clean. I've kept CAE with my mbuna with no problems.
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