Help! I let this tank sit dry for almost 2 years and discovered I had left the air stone suction cups attached to the glass. They dry rotted and the edges of the cups are still stuck to the glass. Is there any safe way (other than elbow grease) to remove these. If not, will this residue harm my fish if I just leave it? I removed as much as I could with the elbow grease, warm water and an old bio floss pad.