i have 4@54w t5 on 2x4x16 and Im seeing bleaching on my lps , sps are fine checked tank parameters and they are with in specs. I started out with 2@ 54 and noticed they bleaching and thats when I went to the four thinking it wasnt enough light. when tank was cycling I was running normal t5s and the coralline algae was really pink and thick but since going to the high outputs the coralline growth has dropped off and bleached too. tank parameters are the same.Im thinking about lifting t5s 6 inches off tank.
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