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Discussion Starter · #1 ·
I designed & built my first sump out of a 40 breeder but decided I wanted more volume overall as well as a larger return chamber (I'm not using an ATO) so I recently picked up a 65g. Essentially I am planning to replicate the current sump but tweak how water flows into the return chamber. Current sump has an under-over-under bubble trap leading to the return chamber. However, this has led to a stagnant surface that I'm using a small powerhead to combat it. Ideally, there is a way to have surface turnover w/o the need for the pump.

I'm thinking of removing the last "under" baffle to help break surface tension. My concern is since the 65 is significantly taller than the 40 so there will inevitably be noise from falling water. How can I reduce the noise while maintaining surface agitation?

Ideas I've considered (with attached sketches for clarity):
1: horizontally mount ~4" wide light diffuser a few inches below the top of the last "over" baffle and put some filter foam on the diffuser. Perhaps adding a second one lower to help as evap. occurs.
2: add a piece of filter foam in the return chamber but next to the baffle that's essentially the same height as the baffle that will always "catch" the overflowing water to curb the noise. But concern is if that'll still allow for some surface turnover.

Thoughts on those ideas? Any suggestions?
 

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Discussion Starter · #2 ·
Not ideal but considering a diy surface skimmer made with a powerhead but make it neutrally buoyant so it'll remain a set depth regardless of the water level. Doesn't eliminate the power consumption but would be more beneficial than just agitating the surface.
 
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