Yes, if you treat all your fish in the QT, then you leave all the inverts in the DT for 8-10 weeks without fish. only fish can get infected with ich.
A side note, both the koran angel and salfin tang (one of the biggest tangs) need a bigger tank than the 150g. they will need at least 7-8' of length to have enough swimming room and feel comfortable, so you should be looking at tanks of at least 240 gallons. the standard 240 gallon is 96" x 24". marineland sells a glass 265g tank with 84" x 24". of course, if you can spring for a 300g (96" x 30"), that'd be the best case.
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375g Envision FOWLR + 125g sump
40g Reef
Current Tank Info: 375g FOWLR, 40g Reef
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