What is this??? I just saw it on my cory - can't tell if it was on the gill or pectoral fin. It fell off when I put her into an isolation tank. Not treating with anything at this point. It's really big, was curled up around the fin and now stretched out it's 1/2 inch long. The little nobs on the right are moving. Taken using a magnifying glass. The fish is swimming, eating.