After not having my tank set for a few years I finally got it running again and I'm back in the hobby! Right now I have some CA cichlids in it and ...well, I'm just not very interested in them. I have had red bellies before in a 55, but only had them a few months. I now have a 150gal that's 72x18x30 with a large wet/dry and 40gal sump under it. How many RB's could I get in the tank? I saw that there are specials for a dozen, too many? Add more? Looking for advice, thanks!