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How long have you had the fish in the tank?
What sort of QT processes have you used to-date?
Has anything been added to the tank lately?
There's a high likelihood that it's either ich or brooklynella - the picture is a bit too blurry for me to identify specifically, but other #reefsquad members have a better eye than me for this...
There's also a chance that it could be velvet, but that's such a fast-acting parasite that it's unlikely to have taken 4 days to show signs.
In all cases, you'll likely want to remove both the fish from the display tank (DT) and get them into a quarantine tank (QT) for treatment.
Is it possible to test them as they are in this tank as I have no other tank to put them in, they are alone in there as it is
I'll be honest. It's difficult to tell what it is from that picture for sure. The best possible way to treat this is to find a 5 or 10 gallon tank for a QT and move the clowns over to it. Treat with Copper and metroplex which will cover all three possibilities. You'll need to leave your display fishless (fallow) for 76 days as well to starve out the parasites that are left in there.
^^^this is your best game plan^^^

