To Boldly Reef ...
Are CPR C-siphon overflows any good? If not, what is a good HOB overflow?
What about just building a durso-pickup instead of the box?
Something like the pickup in this pic. This is what I built for my closed loop. What about modifying it so that it works like a durso with a hole in the cap to regulate flow?
I use the venturi from one of my mj powerheads to suck out any bubbles. If I have it positioned just right it will actually prime itself from completely empty. I just have to make sure both sides of the "U" are filled with water.Is the trick with the HOB using something like the aqualifter pump to keep the siphon?