I am not sure that it is due to the need for a resting place, but rather due to dietary requirements.
1. As they are algae eaters, they scrape on surfaces for algae, including rocks and driftwood (even aquarium glass). Therefore, if there is moss on the driftwood, they may unintentionally "rip" them apart in the process of scraping on the moss. Mileage may vary.
2. Driftwood is mentioned as a possible dietary requirement. Therefore, they need to scrape some wood to aid digestion. If your wood is covered totally with moss...
Many aquarists have kept the fish in planted tanks without any reported major issues. So I would suggest that what you reportedly "hear" is more of an exception rather than the norm. Providing some open surface for them to scrape will probably be ideal.
Mentioned in this article are suggested catfishes that are suitable for planted tank. Sturisoma sp. is one of them.
http://www.planetcatfish.com/shanesw...article_id=287









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i saw some eating algae from the tank walls today though so i guess it's good

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