I've done this as well.. Except I bough a big chunck of Basswood, and a dowel maker drill bit and make my own wooden air diffisuer. Works excellent I agree.. however I still do not get dark skimmate. I may try and increase the inner tube height and try and raise the collection cup as well.. This way I can push more flow and have the air pump on higher so I can get some more skimmate.
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Chad
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