Check your Mag and you need to raise your PH a bit. Xenias like PH of 8.1 or higher, and I've found best success for myself at around 8.3. When mine were not looking so good a while back I was told to get my mag up so I changed salts to RBS because it had more Mag in it and the Xenias responded quickly. I am now using D-D h2ocean pro + aquarium salt (little higher Cal and the bonus of being a bit cheaper the RBS) and it has continued to show good results for everything in my tank.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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