Confusing Rose BTA behavior

[Reeffwkeeper]

Hi. I purchased my first BTA and clownfish approximately 6 months ago. The system has been running for 1.5 years. The anemone hasn't moved from where I originally placed it, and it has retained its bubble tips. Over the past 2 days, the anemone's mouth has been relatively open. I can't see the anemone's insides from its open mouth, and the anemone looks happy. However, I've read that the open mouth is a bad sign.

My parameters are: Temp 79, calcium 440, magnesium 1240, S.G. 1.025, kh 8. Ammonia, nitrites 0, and nitrates less than 5.

Does it look like my anemone's declining to those of you with anemone experience?

 

[debadoo]

It's hard to tell from the picture but it kinda looks like he might be hungry. What are you feeding it?

 

[Reeffwkeeper]

Thanks for your input. I wanted to prevent a split because I have a mixed reef, and I heard that over feeding will result in a split, but I may be under feeding. What do you think? I feed it a piece of shrimp once per week, and "one squeeze" of whatever I'm feeding daily (frozen Marine variety - mysis, clams, Marine Cuisine or brine).