the piece of driftwood I got from the petstore has mold or mildew on it... its blue or green and growing... is there a way to stop it? is it bad for the frogs... what type of stick can I put in there for them to climb on... the humidity level is about 80%... the plant looks great... the frogs look great... they are eating everything that moves... and good looking poops... so what about the tree to climb on.... ?