Probably - as long as your water level is fairly constant.
Oh yes, also make sure the skimmer is properly fitted together before you use it. I was having a heck of a time at first with air bubbles escaping out of the back. The whole unit comes apart for cleaning, and if it's not tightly snapped back together you get air bubbles escaping out the back and this interferes with the internal flow. Long story short, it won't skim this way, just fizz. ;-) Once I figured out what was wrong and put it back together correctly, I got a foam column right to the top of the cone. My skimmate is more watery than most heavy-duty skimmers; it's a medium-dark brownish green tea rather than a dark sludge...but this may just be due to my error in dialing it in.