I will just use few pvc 90 and build that return, over the rim of the tank, and back into the water. and drill a small hole on the pvc at water line which will act as your siphon break.
way less work than drilling holes on the back pane and have to worry about too much water drain into the sump during power outage.
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150DD mix reef with 90 gal sump and 40gal frag tank
purple tang, sohal tang, yellow eye kole tang, fairy wrasse. cleaner wrasse, leopard wrasse, and misc fish.
GHL Mitras 6200HV X 2, MP40 X 2, MP60 X 1, tunze 6095 X 2, Vertex RX6 calcium reactor, Bubble King SM250, Aquamaxx bio pellets reactor, Profilux 3
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