They like to be on rockwork,or at the rock/sand border. They get about 18 inches or more and don't usually split, I don't think they can. They like moderate flow and moderate to high lighting. They don't really move once they pick a spot. For tank params, 76-80F, 0 NO3, 0 PO4, 8-10 Alk. The tank should be stable for at least 6 months prior.