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Have you said yet what light you have yet? Maybe make a separate post in lighting (if you haven’t already) someone probably knows par ratings at certain depths and may be able to help you with the schedule. 15000 kelvin isn’t really the info necessary to advise on lighting.wow now that the LED program switched to evening and moon, the toadstool turned into a mushroom again with no tendricles ( a word i made up) . i use one of the Red Sea app LED programs at 15,000 Kelvin for white and blue,but I edited the program so that it actually gets less strong over the course of the eight hours and there's also little clouds in the program. I don't know if I need it blasted at 15K all day. maybe i do.