Using RO water in coco

[StudentGreen]

Yeah they do but it's universally stupid.

Can’t agree with you any more mate

 

[kin88]

Your coco looks really dry, and it likes to stay moist at the very least. Being too dry is maybe your biggest problem. It's a hydro medium, and it's really hard to overwater in coco. First thing I'd do is give them a thorough drenching, maybe even flush them with 3x water ph'd to 5.8 - 6.0 to pot size. Then back to at least daily feedings. When coco dries out, it messes with the CEC and ph of your coco and you start seeing deficiencies present like you're seeing now with the yellowing.

Probably the best thread I've seen for how and when to water in coco.

HOW TO WATER COCO FOR BEST RESULTS.

Ok writing this cause i see this issue often and rather have a thread to link than explain this each time. This is not my work but a collection of info from many members here and I have put into practice myself. So first off COCO is NOT soil. For best results we want to keep it saturated...

www.thcfarmer.com

That threat is totally focused on growing as hydroponic. You can treat coco as soil or as hydro. I prefer treat as soil. And that Aqua guy is treating as hydro!
You will always find different ways to growing in coco, which doesn't mean that both are incorrect or totally right. It is up to you to find your technique of watering and see how plants react. Cheers