you want fine bubs meshmod your skimmer better then the white, purple and the red pin wheels Ekmat PF4 or a flatback you can bring your bub line way below the neck and still almost overflow it you might half to cut your down pipe to slow down the flow also you can then mod your intake with useing http://www.dwyer-inst.com/Products/P...eName=Ordering up to 70 SCFH when you get the mod tuned in on your skimmer you can turn a crap skimmer in to a great one you would be shocked bubble king style if you slow down the turbulence ALOT more surface area on each bub