I got my tank used and there was a lot of stuff with it. One of the things is this plaster statue of a cherub. The guy had put holes in it for a hose to go in. So I put in an air hose and had the air coming up out of the statue's head. The statue developed these soft white balls coming out of the armpits and any place maybe air was getting through. I could easily rub the stuff off and it was kind of like salt or talc or something. I took the statue out because I was afraid it was hurting my fish. Can you tell me what this likely is? Much obliged if you smart people can tell me this.