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I would never put my entire tank on a single GFCI. A single nuisance trip or faulting device takes down the entire tank. The same with breakers.I'd ask him to check all the breakers in your panel to make sure they trip and get the corrosion taken care for sure as it can cause overheating. Why you would need 2 separate GFCI circuits is puzzling. I assume they are both on 15A breakers. That's quite a bit of current for a single fish tank and you indicated your lights weren't even using them.
If it were me, I would have 2 circuits with 2 GFCIs per circuit, if not three per, for that size tank.





