The 10ks will have a higher par rating then the 20k so that would affect the Zoas. They may just need some time to adjust. You can also try lowering your lighting period and then gradually increasing it back as the zoas get used to it.
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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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