Clam Issue

[sailfintang]

Okay this does not look like a pinched mantle issue or a predator issue to me. I checked the clam and it showed no predators I could see. The clam had its mantle extended yesterday afternoon into the evening and today this is how it looks after coming home from work:

Not sure if there is anything I can do to help this guy out or not. Params listed below;

Salinity: 1.026/35ppt
Alk: 8.5-9
Cal: 480-500
PH: 8.1-8.4 (depending on time of day)
no3:0-5
po4: there is some as I have algae no clorometer to measure it accurately enough
Temp:80-83
Flow: 2 modded maxis, modded k-3, tunze 6045

The clam is in a low flow area when it was on the rocks there was too much flow hitting the mantle.
There are no fish in the tank they are in QT
Only have a few snails and empy shells
ANy ideas on what I can do for this guy, lost my dersa the same way about 2 months ago just thought it was a fluke or bad clam. This has me believeing otherwise.

 

[OrionN]

That is a dead Squamosa. Anything could have killed it. Pinched mantel does not kill that fast.

 

[ludiNano]

How long have you had it?

What lighting do u use?

what do u use for alk/ calcium suplemention?
are u dosing anything else [( trace, iodine...) which i dont recomend.]

sorry 4 the loss.

 

[mscarpena]

How old is the clam, and how old is the tank, also it does look like you have some water quality issues. Also 83 degrees is a little on the high side. A .3 PH swing is pretty large as well. I would test your Phospates just to see where you are. Are you using ro water?