I always hear about how no one likes sea clone but I was running one on the 200 and it was pulling TOO MUCH, I had to cut the sucker back on a timer. If the volume isnt enough to make a good cyclone then you are just moving water around, if you have a good fine mist that can grab the desolved solids then you just might have a nice set-up. we all seem to want to go muck around till we get foam so we can feel satisfied its working, but if your good and balanced, then just keep up on your science and let your tests tell you why it is or is not skimming
but thats just my two cents, and hey im an idiot....