This is from my step-mothers 150g.
I started reefing later than she did and already I know more than her :s I am trying to teach her about how to keep easy coral but she doesn't listen.
Lights are kept on for 4 hours a day, and there are no power heads besides the ones from the return pump. Looking into the tank there is no movement unless its from the fish.
Anyway here is the thing in question.

I think it is gsp that has just lost its color because of the light being only turned on for 4 hours a day, but idk for sure.
Edit: In the picture it almost looks like the tips are shining, really they are not, it's because of my crappy phone camera



