DOC's
DOC's
Both my tanks run Tunze Doc's (a 9005 with sump kit and a Nano Doc), they pull full cups daily. They are obviously better than any HOB skimmer I've used (CPR, AquaC, SS), though I haven't used a big needle-wheel to compare them to. They definetly follow a totally different philosphy when it comes to skimming, their air number (l/h) is always impressive, but they're very compact in the contact chamber (The reason I heard was the large chambers the bubles collide to much and knock the protien off, whether this is true or not is unkown, but they do pull a good deal of skimmate).