New to Canreef...

[Biotech]

Hi Ryan:
Each GFCI is rated for 15amp - enough to hook a few pieces of equipment to it with a powerbar. Separate the equip so that in case there is a trip with one of the circuits, equipment plugged in the other circuit will still provide your main tank with water circulation and heat.
For example:
GFCI #1 - one of your light units, one of the heaters, skimmer and return pump.
GFCI#2 - the other light unit, heater#2, powerheads

So if GFCI#1 trips when you are not at home - your tank will still have some circulation from the powerheads until you come home. Vice versa, if GFCI#2 trips, the return pump will provide the circulation.

If you are not comfortable to replace the original circuit with a GFCI unit, you can get a GFCI extension cord. Revy/Rona has one for about $45 -rated 15A/1800W.

Hope this helps