sure.
I think it is a carpet anenome.
When i first got it, during the day it would go greenish then back to pink but it hasn't done it for a while.
Salinity is 1.026, lighting is 2 T5's and one small fluro, had good water flow for him at the rock top.
only thing that is put into the water is ASW and that was done 2 weeks ago.
only algae is brown and is on a small pain of glass which gets wiped away every week.
The only thing different i did this weekend was clean the skimmer.
Hope this helps
oh and 8.5PH, temp varies 25-26 over the day, and no bad items showing (ie nitrate etc). calcicum at 440. don't know magnesium.