Pinched Mantle & Open Siphon?

[CENreef]

Hi! I've had this Derasa clam for about a month now and I've notice the profession of a possibly pinched mantle on one side of the clam. It is about 1.5 to 2 inches long and retracts when shade is provided/scared. Additionally my bubble tip Anenome had decided to creep over and sting the mess out of my clam to the point where the threads have detached and I was able to move him into a comfier spot. Free of anenome invasions or shading from light. Although, I've noticed that the siphon has been wide open for a couple days, nearing a week now and I worry that my clam is not happy.
I asked my LFS and they told me to feed with pyto- so I did this morning.

Parameters are 1.025 for salt, 0 for nitrates, 0 for phos, 0 for ammonia

I added a picture of when I first noticed a partially retracted mantle to how it is now

 

[minus9]

It's really hard to tell from those pics, can you get a clear shot from above and close up from the front? Turn your lights on the whitest setting possible when taking pics.

 

[minus9]

Also, can you tell us more about the system/tank? Age, how many fish, how much you're feeding? In a zero nutrient tank phyto may help with providing some nitrogen, but I wouldn't count on it as the main source of food, that should be light. PMD will progress along the mantle, you'll also notice the mantle will have "crinkle" appearance as well.

 

[OrionN]

Clear details are what we need. These picture just not clear enough for us to tell. Sorry.

 

[CENreef]

Update:

Thank you guys for replying- I had taken more pictures to update this post a few days ago but I had also decided that even if my clam did not have a pinched mantle that it would only benefit from a FWD... That being said I dipped it for 25 mins and the results are not well. 100% sure that it is gaping now and i plan to remove it from my system if I do not see any progress in the next few days. It's a shame, but I can only learn from instances like this I suppose... attached are a few pictures I took with your guys' comments in mind. I have not gotten a picture of the clam recently as it is closed for most of the day but when it is open I can see that the siphon is a lot more open than in the pictures attached and one side of the clam is completely retracted while open. (I'll add pictures when I am able to capture it)

 

[CENreef]

Update:

Thank you guys for replying- I had taken more pictures to update this post a few days ago but I had also decided that even if my clam did not have a pinched mantle that it would only benefit from a FWD... That being said I dipped it for 25 mins and the results are not well. 100% sure that it is gaping now and i plan to remove it from my system if I do not see any progress in the next few days. It's a shame, but I can only learn from instances like this I suppose... attached are a few pictures I took with your guys' comments in mind. I have not gotten a picture of the clam recently as it is closed for most of the day but when it is open I can see that the siphon is a lot more open than in the pictures attached and one side of the clam is completely retracted while open. (I'll add pictures when I am able to capture it)

Behold, updated pictures of my near dead clam

 

[Shirak]

Sorry to hear about the clam I don't see a lot of shell growth. After a month it should have something there. 0 nitrates and phosphates are not good. How about the light situation? What kind of light and par?

 

[minus9]

Sorry about the clam, but agree that it hasn't been growing for quite some time. Have you ordered James Fatherree's book yet? If not, that would be my next purchase.