The only thing I can say is I've been an electrician since 87 and they DO trip accidently. It's not uncommon during a storm for a small ground interuption to happen which is fairly close to your area. You could have 3 GFI's and one could trip. Can't tell you how many people can't figure out why they have no power on 1 line and all the breakers are on. You should just have something that lets you know if it happens.You should have EVERYTHING around a tank running on a GFI. Do not isolate anything from a GFI. Especially things in the water like heaters.
The purpose is to save your life :shocked: and in some cases like wantvws's it would've prevented any smoking damage and prevented the likely house fire that would've occurred if his sharp mate hadn't been there.
I have had my tanks running for more than a decade and never had the GFI "accidentally trip". If it is tripping accidentally you have a device with defective levels of leakage that should be found and removed. If the GFI trips because of power fluctuations or lightning then so be it! There is a very good possibility it's tripping would prevent over voltages from nailing some of your equipment and rendering it into junk.
GFI GFI GFI every one chant with me GFI :thm::thm::thm: