Pleco rotting away

What other fish do you have in this tank?

I have come to notice that fish in my store get this when they are soon to die (sorry to say..) and the other plecos decide they are already a snack.

EDIT: NJDevilsFan: You like to post "What tank size do you have? What are the water parameters?" Dontcha? :p
 
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The pleco is now in a 120 gallon tank with a pair of convicts and JD's. PH is around 8.

I just moved all my inhabitants from a 40 gallon long to the 120.

The cichlids are doing fine but the pleco just started to rot away when placed in the new tank for about 2 weeks now.

The cichlids are not attacking the pleco either.
 
It could be the nitrate or ammonia thing, I did use the pleco to cycle the tank. But he did not show these signs until 2 weeks after i put him in there. The other fish do not show any similiar signs.
 
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