With added stresses of varying temps and salinity, your ailing chromis will have a hard time recovering as it is.
Add to the stresses a starvation diet (one feeding every three days), and it has even less of a chance. You'll read that these fish feed almost continuously in the wild, surfing the currents flowing over the reef.
I hope you can save it, but I don't know that you're getting the best advice from your LFS. There are some chromis-based threads on the board - have you searched them out? Lots of people have these fish.
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Alan
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