Actually, kribensis are one of the riverine species from West Africa and their natural habitats are similar to that of the rams, although not quite as soft and acidic as the Amazon. Kribs need a pH level in the 6.8 - 7.2 range to ensure an even ratio of male/female offspring. These fish can be kept together, but only if the aquarium is large enough to allow for parental territories during spawning, and a ten gallon tank is nowhere near that.