Lance's 225 gal tank

[Lance]

So, the fish have been in QT now for 8 days. Everything is going pretty well, aside from the fact that I'm going through salt like crazy. Between the 225g, 90g, and 180g and 3 sumps I have about 600gals on the go, and I'm having to change about 30 gals of water in the QT every 3 days to keep the ammonia levels down. It's kind of a catch-22: You want to feed the fish well to keep them healthy but at the same time it's hard to keep ammonia down. If I don't change some water frequently the ammonia level rises quite rapidly. I'm treating with Cupramine right now. I'm trying to find some info on using ammonia inhibitors such as Amquel in conjunction with copper treatment, but can't anything anything. Does anybody know if this can be done? Or will it cause adverse effects?