Please help- Clams won't open

[Westpat]

I was planning on doing a water change today because it has been about a month. I have everything mixed and ready to go and when I checked the tank my two crocea clams were closed up tight. This has never happened before, and I am wondering what is going on. The temp and parameters seem normal.

Here is the other weird things. My mandarin jumped into the overflow and my sea cucumber tried to crawl out earlier.

Corals and other fish are fine, could this be an electrical current issue? Also I am using some RODI from a new but reliable source. Is there a chance it could be effecting the system?

Thanks,
David

 

[Sloth]

Maybe your heater broke?

 

[ClamLover]

Sounds like a tank wide symptom.

Do you have an earth ground probe for your tank's water?

Have you checked if there has been any other animal dead and the rotting body trapped somewhere ?

Or like mentioned earlier, a temperature change. Whichever it is, the change in your tank's condition sounds quite drastic.