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It shouldn't rub off - velvet and ich are under the outer layer of skin. So if it all came off that easy then yes, it seems you have jumped the gun. It's ok. It means you are paying attention and prepared to act if it's needed. Let him rest from the ordeal a bit and see how he does.
+1 If its there one minute and gone the next, it likely was sand or debris stuck to the fish's mucous coat.