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From left to right, top row:
VHO, MH Left, MH Middle, MH Right, EMPTY
X10 controller, Heater, Heater, pH Controller/MaxiJet1200, Co2 Shutoff/Mag 7(calcium reactor circulation)
Grounding Probes, EMPTY, EMPTY, Aqua Controller II, EMPTY
Tunze Stream, Phosban Reactor, Euro-Reef Skimmer, Tunze Stream, Return pump
Each outlet has a small label on the coverplate. T1 - T8 are the top 8 switches on the DJ Power Center. B1 - B8 are the bottom 8 switches.
Each switch is labeled so that I can turn off the appropriate device. When I need to turn off the skimmer, I don't have to unplug two Sedra 5000 pumps. I flip the switch and both pumps shut off. And if I have to find the right plugs, I match the button to the correct outlet and know what the plug goes to. So if I turn off B3, the plugs go to the skimmer. If I turn off T3, all equipment associated with the Calcium Reactor is shut off at once, which is really nice.
The top powerstation is plugged into a 20amp GFCI circuit, and the bottom one is not. Since a GCFI can trip (nuisance trip), I don't want it shutting down the tank. Everything plugged in the top unit is something that might possibly hurt me, like the heaters or my accidentally pulling the light rack into the water. I want the breaker to trip and save my life.
The bottom set runs on a regular 20 amp circuit, and keeps the pumps running which provides circulation to the tank even if the lights and heaters are off (as mentioned above). This has really worked out well over the past 11 months.