The problem I had with a GFCI breaker or outlet is if one powerhead trips it everything would shut down. I have 2 power strips each attached to a GFCI. I've mixed powerheads, pumps, heaters, etc so that I can still run at 50% or so if one GFCI trips. I had a problem in the beginning with my lights tripping my GFCI and I'd come home hours later to find a tank with no circulation.