Great info there, K-R. I have mine in a greenhouse under 50% shadecloth. Poor quality soil and they seem to be doing great.

I am still using pretty much the mix I described earlier. Though I think one of my larger Arios is in the mix KR describes (I bought it already potted in that ), seems to be pretty happy. It's very humid here so I need to have more inorganic ingredients in my mix than you Victorians need. Most seem to enjoy my mix, but not all. Still tweaking things a bit.

Mine get a few hours of direct sun in the morning, then a few hours of filtered sun light and then a few hours of shaded sunlight, most seem to enjoy it, but again, not all. I grow them pretty much the same as my Astros, which do better than the Arios. Most of the Arios are pretty happy. The ones that aren't were attacked by root mealy, or rather I bought them like that and am helping the recover.

I will add that KR definitely knows his stuff and his advice is well worth listening to. His mix has given me some further ideas to playa round with.