Thanks Jay - I have a question - I was going to say do copper and prazipro together - but didn't because I thought with the other deaths in the tank quickly - that mitigated against flukes (i.e. I would have done the copper, then the prazipro together up front).It isn’t velvet - that causes rapid breathing, hanging in water currents, followed swiftly by death.
With that continuous scratching, I’d say this is flukes, but I’d like to wait for a better video under whiter lights.