Hey, I have what looks like black mold growing on part of my coco background (in the moister part of the vivarium). Any suggestions as to how to get rid of it? And how concerned should I be? It also may be algae, but it looks much more like mold to me. It's a 55 gallon tank, a little less than one year old, with about 90% glass covering, 10% screen. Thanks for any help.