Help! Tree Coral Shrinking

[tgr26]

So I purchased a green tree coral frag a few weeks ago. It was doing great, growing new stalks, and polyps always open. Just the past few days, it's been getting the shrinking, droopy look. The polyps are still open, but not as often. Picture of the coral is below, sorry about the quality.

Past few days:

A week ago:

Link for what it looks like:

http://www.bostonreefers.org/forums...-Islands-and-yellow-leather-for-March-meeting

Water parameters:

Temp - 78-80 degrees
SG - 0.025 (was a 0.026 yesterday, but topped off a little today)
Nitrates - 0
Nitrite -0
pH- 7.8
Calcium- 400
kH- 9

My tank is a 28 gallon bow front, with 2 65 watt compact fluorescents. Water flow is moderate around the coral. I've been feeding it every other day with kent phytoplankton.

What might be the cause of the coral shrinking? I have a bad feeling it's going to die soon. Is there any way I can stop this?

 

[cloak]

Just give it some time. Your parameters look to be within reason. Your pH is a little low but I don't think that's the cause. Sometimes soft corals like sinularia, sarcophyton, nephthea, etc shut down for days at a time and then open up. Some of them will even shed a waxy layer before they bounce back to normal. It's just part of the growth process. If things don't look better after about 10 days or so, somethings up.

 

[LAKEM0NSTER]

It really doesn't look too bad. I'd be worried if it stayed completely shut down, no PE, for more than about 4 days.

Maybe some coral warfare is going on nearby?

I had a duncan colony of 30+ polyps close up for nearly two weeks after some nearby PSP, anthelia, got irrated by an aiptasia & released some sort of chemical defense. I'm 95% sure that was the cause as I had another smaller duncan colony about a foot away at the same level that was not bothered.