Another way to test your tank to be sure ...
Purchase or borrow a voltage meter.
Select 120 AC voltage
insert the tip of the black probe into the grounding hole on an electrical outlet ... (its the circle beneath the two slots)
Insert the metal tip of the red probe into the tank water
Watch the meter for any movement. Any movement indicates a voltage leaking into your system.
remove the skimmer ... test again.
replace the faulty pump / heater and test again.
Now .. want some more bad news ...
Stray Current has also been pegged with causing HLLD Head and lateral line erosion disease. So dealing with this in a timely fashion and turning off the bad item asap would be a good idea.
Your tank can survive without a skimmer .... just increase your water changes if it turns out to be your problem.
Good luck
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