what type of powerhead is it?  could there be some electrical leak into the water?
 
If they are made for aquarium, they should not have any dangerous coating, at least I hope!  I use koralia and never even washed them prior to putting them in the aquarium.
 
	Quote:
	
	
		| 
					Originally Posted by reefcat  Temp is 78 and was the whole time the powerheads were in there, I took the powerheads out yesterday. |