I am cycling a 54 gal bowfront corner tank which i have put a couple large pieces of driftwood in. I purchased the wood from the lfs, no tannins are leaching out but i have this white fuzzy growth that i have already cleaned off of the wood once and now it is back. How can i get rid of it and is it going to hurt my water quality? I plan on keeping angelfish, german rams, and some cory's. Will the cory's clean this off of the wood?