I want to make a floating java moss ball. I'm going to take a ping pong ball and tie some java moss on with fishing line. I'm going to tie the fishing line onto a stone so it will float in the middle of my tank. I found a ping pong ball and washed it in hot water. It has a logo on the front and I don't know if that could harm my fish. I will attach a picture. Could the logo rub off and harm my fish?