Eb0la11's 165G Reef Tank Build

[Eb0la11]

Hey guys, so now that my tank is full, I woke up to a slightly lower water line in my return pump chamber. This was expected but kind of forgotten about until this morning.

Basically I want to put together an ATO system and what I have on hand so far is a power fist Bilge Pump that does 200 GPH.

So Im wondering how I can rig this thing up to pump in water as the water line goes down? Im thinking I'd be needing to incorporate some kind of infrared thing or something? Or a ball valve? But that wouldnt really work cause the pump would keep going.

What kind of things are all you doing?