SPS Problems

[jpruitt]

Hello I have been keeping sps for going on one year now and everything has been going good. My tank tends to be a bit of a high nutrient tank but colors and growth are good. Over the past 2 months I did get a good bit of hair algae on the back wall of my tank and just a bit on the rocks. I got to where I could not stand the back wall anymore so I manually removed almost all of the hair algae in one go. Over the next 2 days I have a handful of my sps lose color and begin to bleach out. Still has some color and did not turn white but still a very nocitable change. The others seem unaffected. Tested the water and the results are below.

Alk 9.0
Cal 430
Mag 1400
Phos.17 Hanna
Nitrates <10ppm

If you have any ideas please let me know. Thanks.

[kissman]

PO4 is high should be around .03


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[jpruitt]

I agree. Po4 has not changed in over 6 months. Sps were fine.

[w3bbo]

SPS can handle a wide range of paremeters including nutrient levels. They do not like rapid changes. The key is stability. Do the parameters you mention match the ones a week ago?

[jpruitt]

Po4 after removing the hair algae on the back glass and one 40 gallon water change went from 107 on the Hanna URL to 56. So phosphates went down about half. That is the only change.