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I know that with some fish such as yellow tangs, high levels of amonia or even just stress in general can cause red markings on various parts of the fish. In yellow tangs they appear on the head, but there is no reason why it can't appear on different areas of different fish. This means your fish is having a hard time with its osmotic response, or breathing. Can you lower the salinty in your tank to help out the fish? I would recommend hyposalinty treatment to help with breathing and cure the ick.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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