I have an empty 20 gallon tank with sand. I want to put some type of pleco, some type of bottom feeder, and some type of african cichlids. Any suggestions for those three? What cichlid do you recommend? I want something that will live a long time and wont get too big. Also I dont have much money so it cant be too expensive. I also need fish I can purchase at my LFS and not have to track down. So list the fish and some small details about it. (EX. life span, max. size) Thanks for your help.