150g drop down L reef tank

[Seth81]

Originally Posted by sphelps

I noticed it because I've seen people do it so many times and have it end in disaster. A crab or something makes its way down the overflow and gets stuck on the partially closed valves, backs up the flow and the tank overflows. It looks like the last chamber in your sump is probably small enough that your pump will run dry prior to a tank overflow but this can be bad too if the pump dies as result when you're not around or if your ATO is capable of pushing things over the edge.

Something to consider I guess. You have two drains in the overflow box, you could run two lines to the sump and setup a herbie style overflow. 100% quiet and much more reliable.

+1 for Herbie, mine is super quiet... Just make sure you do it right the first time, not like how I did mine originally.