The idea of the down tube has been in use for a long time to actually increase the number of smaller bubbles by having the bubbles that would naturally float up crash into the ones coming down and thus create even smaller bubbles ... I have seen this explanation in more than one diy skimmer design so wont bother to get something to quote from ... if you dont believe me just surf the net for diy beckett skimmers and a few of them will give a detailed explanation for each stage of the skimmer design.
I cant remember seeing your beckett skimmer listed on here though ... what pump do you use and how high is your reaction chamber Steve ?
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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