Exactly that. Tentacles get skinny, don't expand well, turn white...
How much light do you have, what size tank, how old is the tank, how old is the anemone, what are your water parameters?
old is the tank we'll that is a hard question.
I have had the tank for 1 week.
I bought it used, he had it up a running for 2 years.
I took all his water and everthing and set it up here.
Parameters are getting high ( think I am over feeding )
saltinity is ok everthing else is just on the high side
plain on doing 20% change tomorrow
the tank is 75 gallon
60lbs live rovk
120 live sand
I have 2 110 white lights
and a blue light
blue on 10 hours
white on 8
You have enough light. I think if your water parameters are off then that is definitely why. I remember another post where there water was really messed up and the anenome did the same thing. Do water changes even 25 or 30 if the water is off. And FEED LESS!!!!! Less is better in the case of saltwater or just make sure they eat what is put in.
anemone's will also shrink up like that if they are getting ready to expell waste.....they look like they are melting when they die. i'd keep an eye on it and do the water changes to get your water parameters back down.