ProGrow - I didn't know you are growing in coco too.:thumbsup:

You might try lowering your pH to the 5.7 range. That's more in the realm of hydro.

How big are your plants? What stage are they in? 400ml per day doesn't seem like enough liquid. I had some plants that I left too long in #1 pots and they were taking 400ml twice per day. They've been in #3 pots for one week now and they're using 1.25L liters per day. I know how much they're drinking because I measure my run-off. You do water until there's run-off, don't you?

PC :smokin: