I have seen the rubber lip or chubby pl*co also refered to as a frog mouth. I have a chubby, it is grayish thick lip suckermouth. He's about 3 inches long and I have had him for a little over a year now. He loves the hikari bottom wafers and algae wafers and also loves shrimp pellets. He doesn't rasp on the driftwood like my bristlenoses do, but I see him there occasionally. He does like caves. If you have the same fish, they have the strange habit of laying on their backs upside down under something, looking like they have died. Don't know why they do this, I guess just to drive me crazy. Mine is not shy and comes out frequently and often can be seen posing on rocks. He gets a little territorial with my bristlenoses, but I have never seen blood shed, just an occasional head bump and usually over an algae wafer. He loves my yoyo loaches and often hangs out with them and shares an algae wafer with them. *celebratesmiley*
Planet catfish had them as catfish of the month recently.