I don't like the idea, but only because it will 1) break down over time and 2) infiltrate the LECA, reducing air flow, both of which defeat some of the benefits of the culture technique. With sufficient diligence, one can use the moss and be pretty effective in managing the problems.
A side note - just because the top of the medium looks dry, it doesn't mean that it is throughout the particles, and the root systems will work their way down deeper anyway.
Tanner - any way to move that air horizontally?
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