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Originally Posted by shalu
Tom, apart from "pearling", have you compared actual plant growth in terms of inches/week?
In my non-CO2 tanks, I have been supplying AIR into the HOB filter via an air pump. The filter spits out a mist of tiny air bubble(a small percent of that is CO2, of course) in the output flow. I would see a lot of "pearling" on my plants, and I never thought it could be real pearling and assumed that those were tiny air bubbles collected under the leaves and formed bigger bubbles.
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You are increasing oxygen artificially by injecting air into the HOB...thus you reach O2 saturation more easily, so the plants pearl almost effortlessly.