I'm running two HOBs on a 40b so an inline reactor is not possible. I do plant to get a Eheim 2217 when I stop being so stingy, which may never happen.
The spray bar is tucked behind everything on top of the substrate. If any bubbles are getting out most likely they will get caught by some leaves. Hands down the best thing I have done yet. Been through a few ideas including Tom Barrs in tank reactor with the return tube thing.
Just removed all the fiber floss so it's just 3 layers of course media pad in the bottom. I'll report back to the end of the day.