Ok so during a water change, stupid me accidentally left the heater plugged in after I pulled it out of the water. What's worse, I didn't realize it was running dry till 2 days later. Thankfully, nothing else happened and the heater looks intact (no cracks). It is not glass, its a cobalt aquatics mini therm and only 10W. Question is, is it safe to use to heat saltwater for water changes?