Well I went and bought a carpet anemone for one. Unfortunately I made a lot of changes to the tank all at once trying to accommodate it and I killed it. Well I shouldn't say that, they are pretty difficult animals to keep so it may have just been bad luck. But anyway I bought the skimmer because the nem was going to produce a lot of waste and my little HOB filter just wasn't going to cut it. Plus I had just added my sump shortly before and thought I would give it a try. I'm really glad I did too. My water quality from a nutrient perspective has been really good and it has afforded me the opportunity to feed my corals quite a bit without having to freak out about polluting my tank.
The NAC3 is a really good skimmer for the $. I know someone that has a 29 gallon seahorse tank (lots o' poo!) locally and that tank gets fed 1.5 cubes of mysis per day but corals get target fed. The skimmate that comes out of that thing every 3 to 4 days is so dark and nasty. It also broke in fast. I'll check tomorrow and see what depth of water it is submerged in and get back to you.