Anenome dead??

[jordsy]

I have a Long Tip anenome. Its been through some ruff times with me starting out on my first reef tank. Through the mistakes it always shrivled up a bit untill I figured out what i was doing wrong. I thought i had the levels mastered and my anenome was doing great it doubled in size and is about the size of a Large dinner plate. I added some buffer to the tank about a tabel spoon like I always do and the anenome shot under a rock and under the sand. Its never done this before. What happened and how can i help it survive?