Year old GSP colony closed up

[spearo0352]

I have been letting some gsp cover the back of my tank for the last year and it has been growing really well. For the last 4 days it has completely closed and not a single polyp has been open. I do bi weekly water changes and changed my carbon out. All my sps/lps/anemones seem to be doing fine. Parameters have been stable for as long as I can remember. Is this something to be worried about or should I give it a few more days before I start getting concerned? Its just a bit alarming seeing nothing but purple on my back panel.
sal 1.025
temp 78 F
ph 8.3
cal-430
alk- 10dKH
nitrate- 3ppm
nitrite-0
ammonia-0
phosphate- .03

 

[j.falk]

The water might be too clean...especially if you just changed the carbon. GSP likes water that has nutrients that it can use to grow.

 

[spearo0352]

The water might be too clean...especially if you just changed the carbon. GSP likes water that has nutrients that it can use to grow.

Thanks for the quick reply. I have kept the same parameters for a very long time and I do target feed all my corals 1-2x per week. Their growth was exploding under the same parameters they are under now.

 

[j.falk]

Whatever you changed recently is more than likely the cause for it...something has changed, you just have to figure out what it is.