Help please

Hi,
Had my albino Cory's for about 18months, tank is well established, water parameters all good, no ammonia etc however noticed that my Cory tail looks rather peculiar like it's been shredded and red, wasn't like this yesterday. The tank has 3 more albino and 4 sterbai, been suffering with black hair moss that's started to come under control, could it be related?

Looks to me like another fish bit him. Who else is in there with him ? Or could he have gotten caught in something mechanical?

Back in the fold said:

Looks to me like another fish bit him. Who else is in there with him ? Or could he have gotten caught in something mechanical?

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Thanks for the reply. I have 3 Albino Cory, 4 sterbai and 1 rhombo bard, never had issues with any before l, nothing mechanical, 1 week ago rearranged tank and added a couple of plants. I suppose there is an outside chance he/she got caught when I moved my bogwood or cleaned the tank but I hope I would have noticed. I am keeping eye on water parameters incase of an ammonia spike but tank cleaned weekly. Recently lost for dwarf gouramis due to one being aggressive and think the last one died due to the stress. Tried adding a better pic but camera struggles to focus

Then I am mystified. It doesn’t look like disease and the fact that it appeared so suddenly makes me think it’s a wound from something .

Back in the fold said:

Then I am mystified. It doesn’t look like disease and the fact that it appeared so suddenly makes me think it’s a wound from something .

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Cheers, I am also mythed.