Please Help Identifying Sick Pleco

[LBE1016]

I acquired a 5 year old 4" long Pleco about 2 months ago. I was told it was a Bristlenose but am uncertain. I took it from a 30 Gallon tank that it shared with a 14" Pleco of a different type. The larger Pleco terrrorized the one I now have, would chase relentlessly and suction onto it. The Pleco I have has these lighter coloured patches as well as tiny white spots. I am unsure as to wether these markings and spots are a part of the natural colouring of this variety or if these are wounds or some symptoms of an illness? Also I have not seen it eating any of the foods i have been offering, and have not seen it producing any waste. It is either clinging to its driftwood or hiding in its cave if its spooked. I have provided pictures but am no photographer so I hope they are ok. Any thoughts or help would be much appreciated Thanks

 

[joe jaskot]

Pictures?

 

[AG458]

The tiny white spots could be the beginning of ich, but I'm not sure.

 

[kno4te]

Lighter colored patches could be from the larger pleco sucking on it. Tiny spots could be ich.