I hope the regular circuit breaker is sufficient. Rather than using circuit breakers for each outlet, I would consider to upgrade the relay wiring. Maybe find relay sockets with more secure connections... soldering directly to the relay pins isn't the the best solution.
The whole thing is plugged into a GFCI protected outlet. Separate circuits might be good for reef tanks with lots of metal halides and big pumps, my 100gal setup draws less than 300W, plus another 200W (rarely) when the heater kicks in.
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