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My baby koi is as chipper and cheery as normal, but it has these patches of white on the top of its head and along the back to the dorsal fin. The center of the head patch looks a little green. I can't tell if this is a fungal or bacterial infection. I tried to take pictures, but it won't hold...

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...