SPS turning white.

[JDigital]

No polyp extension... I haven't had PE since bringing it home actually..

I will run a few test kits, but things should be in line, water change was done on monday (remember this is a 20G nano)... I change it every week 10-15% with Aquamedic Salt.I've got a birdsnest in the same tank, and it is growing like a weed. And a 3 0.5" SPS frags that are holding their color. No PE tho.

Lighting is 175MH... Tank does get a bit warm in the day.. 29-30.. drops to 27 at night w/ a heater. Planning to add fans shortly..

couple pics.