My sps are turning brown?!

[chewitback]

My pearlberry colony, along with a neon green birdsnest, and a few other lighter-hued acros seem to be turning a brownish shade where they used to be bright light cream and/or white colors! Everything seems happy and there is new growth on about everything, its just all taking a brownish hue. My sky-blue bottle brush acro is now a muddled purple brownish color! I am using HO T5's and the sps are all at the top of the tank. Calcium is around 600 and everything seems to be within the norm. What gives?

 

[OrlandoReef407]

Check your alk I had the same problem with my sps turning a brownish color I wasn't keeping an eye on my alk like I should everthing browned out took a couple months but finally got all my color back

 

[tang0v]

got a pic? also if you can post your tank parameters...

 

[jsousa]

600 on calcium is abnormally high. Mine is 420.

What is your Alk and PO4? My Alk is 8 and I try to keep PO4 at .03.

IMO, in order of priority, I would say keeping alk stable/consistent is by far the most important thing you can do. Next, maintaining CA around 400. Third, watch that PO4 doesn't get higher than .1 for a prolonged period of time. I try to keep mine under .03.

Oh and flow should be on the list too but that's not for color. I use 2 MP40Ws on my tank.

 

[ZurichOne95]

I've heard high nutrients cause browning in sps. My
friend atm had his brown out from high nutrients

 

[juicesay]

Check your Phosphates and nitrates.

Do you do frequent/weekly water changes?

Doing so would alleviate the pain on the coloration.