Your unknown fish is a mandarin goby that looks pretty skinny, they need live copepods found in an established tank.
Some people have had luck with other foods, try a search on here.
Normal salinity should be around 1.025.
Are you running a skimmer?
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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