Just a few thoughts to throw out there.
Do you have a ground probe. Maybe you have a short somewhere it will kill your fish.
What about that prime you added maybe it is a bad bottle and the chlorine killed them.
Also having the circulation off for the water change dropped your oxygen levels to low.
Just some things to think about.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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