my lfs just started selling more aggressive fish such as bigger cichlids. i would like to try a cichlid tank. the species they have that i think my do well in my tank that they have are (i dont know much about them) jewl cichlid kribensis firemouth cichlid black belt cichlid black convict mixed african cichlids (thats what they are labeled, they are about one to 2.5 inches long,they are white,orange,blue,and yellow.) i have no idea about any of these. i would like to know which of these would go in a 40 gallon, if any of them are comptible and how many of each of them i can keep.