as BorderJumper said - I woujld check my heater first....make sure it is not broken!
Otherwise, I know that my foxface goes CRAZY!!!! if I approach the aquarium with an orangy/yellow tshirt!!! he would behave just as you've described! So I leant not to get close to my tank if I wear yellow or orange colours! who would have thought that they see in colour?!?!?!?
I also don't think that your fishes' seizures are related to the deaths of your crabs.
I keep my pH at 8.2-8.3 when the lights are off....
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