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Yup, looks like he was sleeping under a rock and got startled awake and jumped up to see what was happening. I hate when that happens.Just looks like an injury to me - did it occur overnight or slowly develop? Is the fish still acting normal?
Agree on injury and can be any object. Keep an eye on it for healing and not developing infection which will show redness. Would not be bad to have seachem neoplex on hand in the event it gets infected

