I stand corrected: The sticky says use foil, not tape. My bad. I'll get it out of there. Meantime, the fogger looks way cool, like dry ice enveloping the stage at a heavy-metal show, but is too much for a 20-gallon long. For one thing, the pool needs to be really big, and even then it splashes onto the tank bottom. Both the bad and the good news is that it gets the humidity up RIGHT NOW, so much so that I doubt you'd need little, if anything, covering the screen top to trap humidity. I was up to 70 percent within five minutes. I'm sure it would also go through a ton of water. Oh well. The only way I can see it working would be in conjunction with a humidistat (they're available for around $30) and in a 40 or 55 gallon tank. On the plus side, it didn't seem to vibrate very much, so I think a fogger and a snake could co-exist. I might try it again, but only after getting a bigger tank and a humidistat that I suspect would have the thing on for a minute or so at a time periodically throughout the day.