[stonedragonfarms]

I too use CHC, though I add diatomite to the mix for extra aeration--I would say 80% CHC/20% Diatomite
Like the others, I have never had a problem with Cymbids in this mix. I use the large chunks of CHC regardless of plant size, the only exception being for dug-ups or just-out-of-flask seedlings (they spend the first 1~2 seasons in sphagnum)
Adam