| i don't know which types need wood, but i have heard that some need to rasp on wood to aid digestion. i had a pleco die in my aquarium, and when i bought a second pleco i added driftwood to the tank, and this one has been thriving. but it could be a coincidence.
i wouldn't expect that any pleco would eat so much wood as to ruin your big pieces of driftwood. i have just a little piece of wood in my tank, and i see him on it a lot; however, i haven't noticed any real changes in its appearance or size. think they just graze on it.
__________________ joy to the fishes in the deep blue sea
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55, 30, 30, 20, 10, and 10-gal. freshwater tropical tanks
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