Can someone please help me out? I have a few pieces of driftwood in a 55 gallon, however, one of the pieces has small fuzz spots on it. They seemed to pop up out of nowhere. I have taken it out and scrubbed it a couple times and they won't seen to go away. This particular piece has been in the tank for about a month and was used in other tanks prior to that with no issues. Not sure if it is a fungus, mold, or neither. I'm concerned because recently some of my angels have been dying for no apparent reason. Water parameters are normal and everyone is acting and eating fine. Any adive? Has anyone delt with this before?