Vortex diatom filter

[chewie]

I am thinking about getting a vortex diatom filter to polish my water once a week or so. Has anyone used one on their reef tank? I know the are great at filtering water (down to 1 micron) and making water crystal clear. I am thinking they may be to good though, removing benifitial filter feeder food, ie phytoplancton. Any one use one?