if the polyps are extending thats good, it should stop dieing back. the lighting is sufficient if the dieing back stops and the polyps extend daily. however you will always get faster growth when you go lower in the K scale ie 10k will be lot better then the mixture of 15-22k you have right now. even know they look the best they grow corals the slowest. i always run at least 50% 10k's or lower.
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