Nice thing about 2 separate circuits with specially with GFIs, is you're able to split the load so if one GFI was to trip, whole system doesn't crash. If the total load is okay on a single 15a cct, still can run separate GFI receptacles.
Another thing to consider is on a single 15A cct, you can have something like 12 devices (lights, plugs, etc). Depending on how things were wired, you might have your fridge on the same cct as your tank, them you plug in the vacuum down the hall, also possibly on the same cct. Sort of just plugging in a extension cord might not be any further ahead.
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