I had a 55 I wasn't using so I decided to make a sump. I added a spray bar that sprays onto the prefilter then drips onto pot scrubes (media will be added after sealant cures). Now for the question, should I use the powerhead where it is for air exchange? I will be using the sump on a 180. I am not leaving it on the stand. I just used the stand while building it.
Any other suggestions appreciated. Thanks T










I think the Powerhead will work out good. I'll let it cycle for a few weeks and add some more media. 
