Well, tank has been established over a year now and has been very stable over the last 6 months. Everything doing great.

I purchased an angel about 2-3 weeks ago. Over the last few weeks been nothing but hell.
Lost a fish out of nowhere. Then my Midas blenny is fine one day, next day pale and on the ground with cloudy eyes and dead within hours

I then notice my angel and both my clowns not as active, pale,, and almost like a white dust on them, not ich.

I test tank. Everything is perfect

I pull them all out of DT and put them into QT with cupramine and melafix. Angel doesn’t make it through the night. One clown dies in a day. Last clown is still covered in dust but active and eating. Leopard wrasse has no issues.

Currently treating main tank with Polylab Medic which has great reviews.
Fish still in QT.

Any ideas? Suggestions?

This sucks

Again, symptoms are: pale color, whitish “dust” on fish, cloudy eyes, inactive