comments on a QT system and help with method

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Though had no signs until now, believe I brought ich into my system last April with a purchase of a Regal tank. Since positive is ich, planning on setting up a hospital tank for all the fish and allowing my reef to go fish fallow for at least 4 weeks.

Have a 33g that if I can drill (will check for tempering tomorrow in the sunlight) will install a bulkhead on bottom. To not take up space thinking just installing some sort of standpipe (probably Durso) without a overflow box. The 33g then will drain into a 15 or 20g to be used as a sump in which I'll install my skimmer from my main system, (running main tank skimmer-less). Have a small pump which I'll probably get a couple hundred gph that I'll use as a return. Reasoning for going with this setup is with fish load I can get increased water volume and filtering.

For a treatment plan, since only the tangs are show a few spots each and seem not distressed, on trying hyposalinity. Was following this thread but not sure if I should just drop the fish into low salinity or a gradually drop. If the hyposalinity doesn't work then switching to copper.

I'll have to take my 145g apart to get the fish but have Purple and Regal Tangs, Foxface, clown, 2 damsels and a 6 line.