Off the floor is best so that any roots that poke out of the bottom will naturally air prune and not bind themselves in the pot, which will also encourage the formation of more roots higher up in the pot.
Total ignoramus on coco. Going to try it soon, so learning what I can about it. All thoughts and suggestions are welcomed. Also, would air-pruning pots be best and what size for up to 1metre-ish high plants?
Read the dosage section in this link from a UK company I use and see what you think you should use but you should only need to do it twice as the whole point is to just inoculate the roots with the endo-mycorr species and then they populate within the roots, forming a symbiotic relationship...
I've killed the plant now... maybe in haste but I was annoyed that I wasn't stealthy enough. I'm not desperate for a smoke and the learning is the main driver for me, so no harm done but the loss of a couple of hundred quid in buying stuff I won't use again, like the tank and air pumps.
There's the churning of bubbles breaking the water surface to deal with as well echoing against the plastic top. I still had another pump to add. I think the tent acts to amplify the noise and also 60L of water and tank vibrating against the floor.