despite the fact that this feeder was made to point up all the time, keeping moisture out of the PLASTIC housing where th food is held, this feeder STILL becomes extremely moist within a day or two. I left it on the tank and people who had come by the house checking on it said that it had become all disgusting and dirty inside. Any sane person (unfortunately, this wasn't me until after the experience) who understands science should be able to see that plastic, over hot, evaporating water, will steam or fog up on the inside. its what happens to the plastic or glass over your aquarium light, and its the same thing for this plastic feeder housing. It will just end up being a big mess that you have to clean up (and STINKY).