what is wrong with my Colt Coral

 

I bought a 24 gallon nano 3 months ago used, lots of corals.  Everything is doing well and good growth.  All water parameters are good:  0 for nitites, ammonia, nitrites.  20 for nitrates, 500 ppm for calcium and 10 hardness.  I do 10% water cahnges every 3 weeks with wtar top offs in between.  Anyway, this colot coral has looked like this for 2 days..loosk all purple, but rigid.  Not a nice pink or flowing like it was.  All other corals look good, thriving, etc.  Only two changes have been made:

1.  i added a Royal gramma 3 days ago.  I ahve never seen it near the coral.

2.  Swithced from 50/50 72 watss of light 3 weeks aggo 10 150 mh and 28 watts actinic.  i went through a slow acclimation phase with the lighting.  the other coral really started growin well with the improved lighting.

 

Is this coral sick? pooping?  resting?  It is just odd and I have no idea...Input greatly appreciated!

 

rick

Here is a colt coral, now called Klyxum. It didn't look like this did it?

Yes please post pics. This hobby is all about the visual and the geekiness of learning and knowing.

If you want to read the ramblings of an old hobbyist and possibly learn a new thing or two, look here:http://www.utahreefs.com/forum/forum_posts.asp?TID=9244