I just finally got a reply from an aquatics forum that I joined before finding this site where I posted the same question. They claim that it is probably a tiger pleco. Looking at images there were some that could sort of be a maybe but I don't see it.
The poor critter also got ill but I think it is going to make it. I believe it to be a bacterial infection as, just about overnight, became lethargic, dorsal fin flat on the back, stopped mouth walking the tank, eating less and lost most of the color. I didn't want to dose this new of a tank with antibiotics so raised the temperature to 85F and broke up the algae wafers I feed into smaller pieces and spreed around the tank to make it easier to find food. Present condition is that the critter is more active, eating more like normal, dorsal fin back to usually erect and back to mouth walking the tank sides a bit. Also the color seems to be returning. The other three fish in the tank have shown no signs if illness.
I think it quite probable that stress caused this to happen as I removed a large fake tree trunk from the tank to remove plants I had going through some of the openings in preparation to probably ending up going with some dwarf cichlids. Also to make it easier to 'vacuum' while the tank finishes cycling. Prior to removal the tree trunk was used for mouth walking as much as the tank's glass and I believe it spent most of the 'lights out' time inside the trunk.