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Old 04/28/2017, 07:49 PM   #42
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Join Date: Mar 2010
Location: NE Miss
Posts: 608
Originally Posted by greengeco82 View Post
Day 31

Since the last update, I increased lighting from 6 hours to 8 hours a day. When I had low nutrients in the past, everything would bleach out. Now corals seem to be taking the increased lighting with no ill effects.

This paper argues precisely that P out of balance too low makes coral more susceptible to bleaching. Cool that you seem to be confirming this in a tank setting.

"P starvation reduces the photosynthetic capacity (Fv/Fm < 0.5) and renders the corals susceptible to heat/light stress. Alternatively, P starvation might result when zooxanthellae growing under nutrient replete conditions are deprived of P while nitrogen levels remain high."

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