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I had something similar happen to me. It was likely an internal parasite, and it infected my healthy clown. They all died unfortunately. You should try treating with API general cure with seachem focus. Your fish might be perfectly fine, but IME I wouldn’t risk it.This is interesting. I saw a very similar thing yesterday. A white "string" hanging off the underside of one of my juvenile frostbite clowns. It was about an inch long but he swam by the powerhead and it blew off. The fish seems well and is eating normally. Nothing to see today.