Well that's no more stealthy than say, DWC for example, but fog feed technique is by far the best set up IMO. You'll spend about $300 for a proper fogger for 2 plants. The cheap ultrasonic things you put in the reservoir do not work well for fogging since they don't produce a small enough droplet. You really need droplets less than 10 micron or you'll basically be misting instead of fogging.