I'm so sorry for your disaster and hope your fish survive. I recently found my 29-gallon (fw) tank -- heated by a Marineland heater -- at 90 degrees. Needless to say, I immediately changed out about 13 or 14 gallons of water and prayed I wouldn't lose all my fish. I was fortunate, I only lost one hatchetfish, but still. I have Marineland heaters in all my other tanks and am just holding my breath. Keeping my fingers crossed for you and your fish.
If I were you, I wouldnt risk it, and just change them out and sell them on CL.
-Aaron