Budget doesn't exist in this hobby: Brian's 45g Build

[Etaloche]

Originally Posted by Myka

Make sure you have enough volume in the sump without the check valve. It will fail at some point - usually when you're not home. Murphy's Law.

You mention the return chamber was overfilled in your leak test photo, but it's actually at the level where it should be - it should be about 1/4 - 1/2" higher than the last baffle so that there isn't a waterfall into the return chamber. If you have a waterfall that makes the baffles a moot point.

Looks like it's time to get salty!

When I ran the test in the previous picture the return nozzles were placed high enough and when the pump was turned off they weren't submerged so didn't even use the check valve.

I never thought of that in terms of the water level in the last chamber. Totally makes sense though.