So, i have a 30 gallon tank that is right now being used as a community tropical tank and i have been thinking about getting rid of them and getting some convicts. I have never owned any but i always liked them. I have a Malawi tank right now but i have heard that adding convicts to that wouyld not be a good idea. So is a 30 gal big enough for convicts? If so, how many could i put in there?