If QT was just for ich I might be less concerned. But ich is really the least concerning of all the parasites that new fish may come with.
There are things far worse than ich out there, parasites that reproduce so fast that you have little to no time to react before you start losing fish at large.
Ich usually gives you plenty of announcements - in some cases you have a month or more to make up your mind whether to treat or not, and if treat with what.
Amyloodinium, Brooklynella, Monoganean (skin and gill "flukes"), Uronema,... may not give you a fraction of that time before you encounter massive losses.
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Pairs: 4 percula, 3 P. kauderni, 3 D. excisus, 1 ea of P. diacanthus, S. splendidus, C. altivelis O. rosenblatti, D. janssi, S. yasha & a Gramma loreto trio
3 P. diacanthus. 2 C. starcki
Current Tank Info: 200 gal 4 tank system (40x28x24 + 40B + 40B sump tank + 20g refugium) + 30x18x18 mixed reef + 20g East Pacific biotop + 20g FW +...
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