Hi, I only know about Common Plecos. Commons need bogwood to rasp on, I have got mine a large piece of Mopani. They also need places to hide, mine hides under or behind the Mopani wood. He is 11" Not sure of the needs of other Plecos. What sort have you got? PS I didn't read the second title of your post, so I have answered your question. I must read more slowly!