anorexic pl*co

it's possible he has parasites. You should put driftwood in your tank, maybe try sinking a cucumber slice and leaving the lights out since they usually are more active in the dark..

Also, next time don't waste your money on 1/2 dead fish.

often new plecos will not suck on the glass or axcept algae wafers right away, as they may have never had them before. keep putting small pieces of algae wafers in the tank and hope that he finds them some day.

Try some zucchini blanched in garlic water. Lots of garlic. Garlic is said to stimulate their appetite and he may not be able to resist investigating. If he tries a bite, you win.

Roan

I've left Cucumber slices in for 48 hours and they were totally consumed. I slice them rather thin though, like 2 cm thick.

i guess we're talking about a common pleco here? they will rest and hide in the driftwood but they don't use it as a large part of their diet, if at all. how does your pleco's belly look? if it is flat, then you have a chance of it surviving. zucchini with garlic is the best thing to try - blanching means to boil it for 30-60 seconds.
if your plec's tummy is caved in, best of luck but don't hold your breath. if plecos go too long without food, whether during a long stressful shipment or refusing manufactured foods at the store, the bacteria in their digestive tracts will die. once it is gone it doesn't come back. your fish can eat but none of the nutrients are being processed or absorbed and it can be full of food but slowly starving. if it looks that way, best to bring it back to the store and get one that shows signs of being a good eater.

Oh, that is a pretty if miminalist tank. Those plants don't look real though in the pic, except for that swordplant in the left back corner.