White spot alarm!

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Vlowman
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Hello again,

Apologies for my frequent posts - there just always seems to be something!

So, I've just seen a white spot that has appeared on one of my platies' tails. It's a bit odd as you literally cannot see it when he is somewhat shaded, but as soon as the tank lights catch him - boom, there it is. I'm hoping someone will reassure me that this is not an illness but some sort of curious property of his body. But either way, it'd be good to know (and know what to do if there is an illness here). It doesn't really seem 'fuzzy' like I might expect a bacterial growth, nor is it like 'a grain of salt' attached to him - it seems to be within the tail somehow. It wasn't there yesterday.

Images of the now-you-see-it-now-you-don't spot here:

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Many thanks
Vlowman
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Update: LFS man thought 'parasite' and I'm treating for that in a quarantine tank. Annoyingly I was quarantining some new moss on coconut features and didn't realise I was effectively pouring copper on them. Not going to be able to use them in the main tank now because of the shrimp. So annoying.
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DoubleDutch
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What kind of parasite are you treating for ?
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plankton
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Looks fungal from the pic, often a secondary problem after damage.
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