Yes. The freshwater dip will buy you some time. It's amazing the number of attached parasites that drop off during the f/w dip. Amazing.
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Velvet often attacks the gills, unseen to our eyes until it is too late. You'll be giving the fish easier breathing by removing some of the parasites attached to the gills. That's how the f/w dip buys you time. Untreated the fish rapidly suffocate.Fresh dip all fish?
Only Achilles and purple tang showing signs.
Agree. To add to this, that Achilles was dead when I saw it in the first photos, unfortunately. A velvet infestation that bad only ends one way for them. Good on you for trying and I’m very sorry for your loss.You did everything you could to try save your fish. Sometimes even when we do everything right, we still lose fish. So many unknowns: how the fish was collected - cyanide, blasting, etc., shipping trama, diseases exposed to during shipping, etc.
But here's the toughest part. Many collectors, shippers, and LFS are keeping fish at below therapeutic levels of copper to reduce losses and keep the fish looking sellable condition. Copper can be rough on a fish. It is after all poison. And most fish's colors fade from the exposure. So we buy from them and the sub therapeutic level wears off and the disease(s) comes roaring back, often without the visible symptoms because its attacking unseen in the gills. So by the time you finally see external symptoms, its often too late. The internal damage was too great and the fish's immune system has been compromised.