I don't want to stick my nose in where it doesn't belong so just ignore the following comment if it doesn't apply. I noticed in your set up the the SVM is sitting on the counter next to the cooler and I remember reading that you must have the controller and air pump higher than the water level in your cooler/container. This prevents moisture from running down the tube and damaging the equipment. I didn't want to see you loose the SVM.
Thanks
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October 2012