I think I got the wick length right but the channels are huge. I have the wick sitting in the vertical channels and it works.Cant topfill without leaking, and filling from the bottom is almost impossible. Filling from the bottom with a syringe is almost useless. I had to put a drop in at a time and suck through the drip tip so the juice would fill the tank. Pain in the .... Anyone have one of the black ones and figured it out?