Refugium help with drawing

[supermarvin76]

I am buliding a regugium from a 20gal tall tank. My main question is that the "wall" before it overflows into the area where the sponge is, is taller than where the water is coming out from the bio-ball area. I am going to try to attach a poor drawing that I made of it. I copied the idea from one that I saw in the store. This is for a fish only tank with very very minimal live rock.

Please bear with this terrible drawing!!!

 

[electrikat]

Please consider using lr rubble instead of bio balls. Your fish will thank you. I'm not sure but the back pressure of the water should push it over the wall.

 

[RMPD109]

I second the LR idea. I dont know if it makes a difference but the bubble traps I have seen either have 3 baffles or 2. If it is 2 than the first one is from the top down and the 2nd from the bottom up. Check the attached link for some more info.

http://www.melevsreef.com/what_sump.html