68 Gallon Rimless Reef Build

[zhasan]

Originally Posted by gregzz4

Mike was referring to a hole in the return line to prevent backsiphoning of the DT
The siphon will break wherever you drill the hole, instead of it siphoning to the bottom of your return outlet
If you go this route, keep in mind that the drilled hole will be spraying water while your return pump is on, so plan where you want it pointing

Oh I see. My return line also has a hole on top of it.

And I had no idea about the hole spraying water while the pump is on... I'll have to take a look into it. I think I'll clean my tank today and take a few pics and show you guys what my tank's return line and drain pipe looks like!