More fish fin problems...

JohnHuff

I know nothing.
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I have 3 small koi with this problem. All 3 of them (and none of the others) look like someone used a pair of scissors to snip off a 1-2mm portion of their top caudal fin at the tip. All 3 are new fish and all other fins look ok. Is this fin rot? I don't think it is because the edge looks too straight and unragged to be rot and no other fin seems to be affected.

My water is clear and clean and I've been doing regular 10-20% water changes. Has anyone else seen anything like this? TIA.
 

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