this is a really interesting experiment....i have seen rock wool in hydroponics for years and i recently got two plants from Marlow that were mounted with a bit of rockwool under the plant over the cork.
i know that the "downside" of the rockwool is that it will degrade and eventually become a place where there will be no air movement - i feel like this takes YEARS like when you unwrap a store bought phal and there are three layers of sphag from the three up-pots and then a small clump of sandy rotten rockwool in the middle where those roots are often in poor health.
please keep this updated
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