I've got a 90 Gallon All-Glass with 3 fish (Blonde Naso, Blueheaded Wrasse, Clarki Clown), one anenome, about 100 different cleanup critters and 6 corals at this point with 100lbs LR and a DSB. I was given a SeaClone Skimmer which didn't work great so I purchased a Prism Skimmer. Just recently, I sent back my old SeaClone which they replaced with the new version (they made some minor mods). I was going to throw it in my sump tonight to get a little better skimming. The Prism is rated to 90 Gallons and the SeaClone is rated to 100Gallons. I would be overskimming by 90 Gallons... assuming of course that the SeaClone is really all that great anyhow...