Substrate in hospital tank

[EmilyB]

Up to six weeks.

As a tang keeper, I don't fear ick anymore and treat with nutrition and water quality, and a little garlic.

But severe cases do require attention - if it were me I'd do the hypo, I've done it and it is slick. Skip the FW bath imo, it is stressful and CAN kill your fish although clownfish seem to take it exceptionally well.