Your plants are anacharis scarlet temple and a water Hyacinthe (sp). I have never had any luck with Petsmart Stem plants. The tops will grow great but the bottoms will rot.
Alright. You guys definitely are the experts. Within a few hours I noticed the peacocks nipping at the corydoras and despite my wife's whines that it could wait until tomorrow, I moved the corydoras to the 40G with the convicts, tiger barbs, and six other corydoras. Is that too many corydoras in that tank now?
Also since the peacocks will outgrow the tank, kill tankmates, and eat plants....I'll return them to the LFS. As far as this tank what are your recommendations for inhabitants? Are yellow labs nicer? I love cichlids and medium sized fish and am not a fan of guppies, neons, and other tiny fish that seem to die so easily.
Yellow labs are mbuna and a bit meaner than peacocks. For a 20 gallon cichlid you could look into kribs or rams. If you were willing to go with smaller fish a 20 gallon makes a nice shellie tank. Neolamprologus multifasciatus is a good shell dweller for beginners. In a 20 gallon you aren't going to have a lot of options. Most african cichlids need at least a 3 foot tank with a 4 foot being ideal.