True hyposalinity will kill all corals and inverts. I currently have a 120 running at 1.011 cured the ich on everyone but the original puffer who brought it in. Its been 3 months and he just cant kick it. Im going to quarenteen him and treat with something. I used a kordon brand in a different system for my snapper and you could tell the live rock died. Algea wouldnt grow for months. Kordon rid ich i believe, and it did eventually cure my tank. Id pick up a 10 gal for under $20 and treat the infected fish in there . Ich wont survive in your tank with no fish for 3 months i believe. Cleaner shrimp always helps, but most treatments/hypo salinity will kill them.
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