Tank trouble!!

[Aquattro]

I noticed over the last two days that I have some kind of problem (in the tank). I recently removed 2 Hagen powerheads and replaced them with 3 maxijets. This is to run off my new (used) RedSea wavemaker. I hooked everything up and noticed that one of the powerheads wasn't working. It turned out to be a problem with the wavemaker. I didn't worry about it. A few days later, I figured I'd plug the non-working PH into a full time power source while I wait for my new wavemaker. I had to adjust it for direction and during this my 4" Maxima closed up (it's about 3" away from the PH). I plugged in the PH and my clam hasn't opened since. Last night I felt that since this was the cause, I unplugged the PH. This morning I notice that the clam still isn't open, although I just turned on the light, but also all the corraline on the rock the clam is on has turned white for about 5" down the rock. The clam sits on a separate rock in a pinnacle shape. The corraline on the clam is also turning white. 2 other small areas in the tank are turning white also. Is this related to "leaky" PH? Or is this unrelated? No other changes within this time frame.
All fish, corals, and other clams are fine. Water quality is perfect (although I haven't checked pH yet).
Only other change was the addition of a Ca reactor 3 or 4 weeks ago. I don't think it's related to the reactor, but opinions are welcome!

Steve, if you could come by ASAP with a multi-meter, we can test the powerhead for stray voltage.

I do not have a grounding probe...does anyone?

Any and all ideas are more than welcome. I realize that if it was the PH, it could be days until I notice a change. I'm not in awaiting mood though, and would like to explore all ideas!

Thanks.