I bought my chilean rose a few weeks ago from someone who owned it for 2 months. He had been keeping it in a 20 gallon tank full of sand so I moved it into a ten gallon with some asian moss and some hiding places. She hasn't eaten yet but I assume that's because of the stress from the move. What I'm not sure about is the bright yellow and grey patches of fuzz that appear to be growing on the side of her house. Does anyone know what that is? I can't find anything about it on the internet and I'm worried about a possible illness.