Gsp turning red

[ccantlin]

Over the past couple of weeks my green star polyps have started turning red?
What's happening?


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[BigRedsReefs10]

They look to be browning out, and judging by the algae growing everywhere in that pic is say it's a nutrient issue. Could also be your lighting not being strong enough to support corals. What are your params and what lighting are you using?


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[ccantlin]

I am using the two strip current pro 72' fixture. So lighting isn't a problem.
Nitrate,ammonia,phosphates,nitrite, are all 0. Parameters aren't the problem.
My moorish idol wiped out the entire rock over a month ago and all of the gsp came back red. But at night the entire rock is green under the actinics.



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[BigRedsReefs10]

Well that isn't the strongest light, but it should be more than enough for some gsp, I'm guessing it's browning because of the excess nutrients in your system. A few large wcs with manual removal of the algae should get you on track


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[ccantlin]

How many gallons should I remove from a 400g system


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[BigRedsReefs10]

In that big of a system it's going to be hard to make any real difference through water changes. What are you running for filtration, specifically phosphate control?


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