Clam not opening

[MahiMahi]

I've had this clam about 6 months atleast (pic 1) . I recently bought another clam Bc I thought I had these guys under control and since I've added 2nd clam my original one has slowly started to receed and now about a week later it has no mantle showing and is closed up except maybe 1/4 in. The new clam (pic 2) was opening fully for a first day and at LFS but closed soon after.Nothing else has changed recently except for the addition of the new clam , could this have brought a parasite or something w it? My water parameters are good
Dkh 10
Cal 400
N 0
Temp 80

I'm pretty positive this is something from the new clam . Should I fresh water dip it?

 

[MahiMahi]

Here they are as of today , I don't know the specific names for these guys either , a lil help?

 

[mr_X]

Check for tiny snails around the base of the clam. Also look for what appears to be a clear mucous.

 

[Sniperhank]

First looks like a maxima and the other might be a derasa clam. Either way, they aren't extending their mantles. Have their been any small snails on them? With the corals it looks like lighting should be fine, but what is it just for reference?

 

[MahiMahi]

Check for tiny snails around the base of the clam. Also look for what appears to be a clear mucous.

There is a clear mucus around the foot

 

[MahiMahi]

First looks like a maxima and the other might be a derasa clam. Either way, they aren't extending their mantles. Have their been any small snails on them? With the corals it looks like lighting should be fine, but what is it just for reference?

Custom LEDs
Cree rapid fire w 6 whites 10 blue

 

[mr_X]

That mucous might be the clam building the bond that will hold it in place. The mucous I am referring to would come from a clam predator called oenone fulgida. It's a worm resembling a bristle worm. It spews that mucous over the clam and smothers it to death, then burrows a hole through it's shell and eats it clean.

 

[MahiMahi]

That mucous might be the clam building the bond that will hold it in place. The mucous I am referring to would come from a clam predator called oenone fulgida. It's a worm resembling a bristle worm. It spews that mucous over the clam and smothers it to death, then burrows a hole through it's shell and eats it clean.

Weird! That's what I thought to , it was just its foot . Hmm

 

[mr_X]

Google "Pinched mantle". That's contagious.

 

[MahiMahi]

First pic looks familiar