I had the same problem a year ago. He's alive and thriving. You just have to find what works. I've had many plecos. They won't eat just about anything, and will actually starve themselves to death.
You NEED a cave or log for plecos. They need to escape from the busy of the tank.
try feeding frozed bloodworms, cukes, frozed shrimp/krill in addition to driftwood, sinking wafers, and weekend feeder cubes
here's a link of my desperation
http://www.monsterfishkeepers.com/forums/showthread.php?t=213349
You NEED a cave or log for plecos. They need to escape from the busy of the tank.
try feeding frozed bloodworms, cukes, frozed shrimp/krill in addition to driftwood, sinking wafers, and weekend feeder cubes
here's a link of my desperation
http://www.monsterfishkeepers.com/forums/showthread.php?t=213349