Yep, placing them in the HOB is the best plan as it will force water through them and make the removal process much more efficient.
With velvet and other diseases so wide spread these days, I usually put fish into a cycled QT and get them eating. If all goes well I start copper by the end of day three. Too many fish coming in that have been in sub therapeutic copper and it starts wearing off quickly. And they often don't show any of the usual symptoms until it is almost or is too late. So, I get going on the copper ASAP.
With velvet and other diseases so wide spread these days, I usually put fish into a cycled QT and get them eating. If all goes well I start copper by the end of day three. Too many fish coming in that have been in sub therapeutic copper and it starts wearing off quickly. And they often don't show any of the usual symptoms until it is almost or is too late. So, I get going on the copper ASAP.