With any luck, they'll breed almost as soon as you put them in, and the tank will be full of baby and juvenile cichlids. It'll be an active tank no matter what. And I can honestly say I have never heard of a shy convict, so it's not like you need to keep them from hiding.
Why not keep the mollies you want in a pond made of a plastic box? you can even add an acrylic window. It's cheap, and the mollies don't evn need a heater, just an airstone and some substrate for the bacteria to colonize. If you stick some house plant cuttings in, you'll be able to waterchanges only when you feel like. Easiest fish there is to keep. Mollies are easier than bettas, goldfish or guppies, and they breed constantly.
Why not keep the mollies you want in a pond made of a plastic box? you can even add an acrylic window. It's cheap, and the mollies don't evn need a heater, just an airstone and some substrate for the bacteria to colonize. If you stick some house plant cuttings in, you'll be able to waterchanges only when you feel like. Easiest fish there is to keep. Mollies are easier than bettas, goldfish or guppies, and they breed constantly.