Some people say water every day until it comes out the bottom of the pots. That is definitely not working for me. I don't know if that's because the plants aren't as big as the pots yet or because I didn't mix the coco with a less absorbent, airier something, like perlite or clay pebbles.
I am having trouble dialing in the nute EC because I have to wait so long between watering to keep from drowning the roots. My best plant is the one that I have watered the least. Others have had high EC's, low EC's, flushes, and rhizotonic. They all look bad except the one that has had the least watering.
It's hard to measure the EC of the coco because the only available standard I have found is from Canna, and uses a 150cc sample of coco, which is not practical in small systems. My new game plan is going to be to water them with varying levels of nutrient and see which improves.
Any suggestions from people who actually have first hand experience growing with coco in hand-watered pots would be greatly appreciated.