I don't have an Apex, but from a quick google it seems you would connect it to a 'Switch Input Connector'. Check the manual for that text, you should see something like it. There is no polarity from a float sensor -- one direction it's OPEN and the other it's CLOSED, operating like an on/off switch.
Definitely not a power plug, this is DC, and the switch inputs are testing for connectivity only (very small voltage/current).
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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