Elegance receeding

[mrcrab]

I've had this elegance coral since 8/07. I bought it from a fellow reefer whom had it for 6 months before and who thought it was collected in Australia. I noticed it receeding today and was looking for some advice.

It's in the bottom corner of a 350 gallon 30" deep tank with Ushio 14k DE and T5 bulbs. The bulbs are at the end of their life and I am waiting on a back order which should be here next week. It has looked very good up until the last night and today. I do not feed it but the tank gets fed heavily with plenty of mixed frozen foods including: mysis, bloodworms, krill, cyclops.

I noticed yesterday after the main lights went off that it seemed to have shrunk more than usual and today it remained that way all day.

The only thing that's changed is Sunday night I cleaned the sump. The main tank was shut down, the sump was drained scraped, rinsed with sw, dried and refilled. About 90 gallons of water replaced, twice as much as usual.

Here is what it has looked like since I've had it:



Here's what it looked like tonight before lights out:







I'm going to read the elegance theory thread now but any help would be greatly appreciated. This is my favorite coral.

Thanks