That's the wrong way to feed mate. Have a look at the basic guide man and that'll show you what to feed and when. 1.0ec to 1.5 is a massive leap at this stage of growth and is not the way you should approach feeding. 0.2 increments are all you should ever need to keep you in line with the plant's needs at any stage of growth.
Coco doesn't need cal or mag supplementation unless the plants show you they do, which in my experience is hardly ever. It's a complete myth that calmag is needed
for a healthy grow. If you do want to add it in later on, put it in at 0.2 on top of your base feeds.
If your EC is only 1.0, and some of that is being made up of cal & mag, then that's why your plants are a bit hungry. It's as simple as that.
If you started with a baby feed and fed at 1.0EC, you'd have perfectly healthy plants.
When you add in extra calcium and magnesium - two secondary macro nutes which should be in good supply from any good coco feed - at the expense of the base feed, you just throw it out of whack by taking away what the plant really needs.
It's not that your strain is a particularly heavy feeder; most strains will be on 1.0ec at that age. Like I say, have a look in on that guide and you'll see mine at the same stage and what they look like on 1.0ec of baby feed.
Look up formulex, or an equivalent starter feed, and try and have a bottle of that handy for the early stages of growth.
What's your background (tapwater) ec by the way, and are you including that in your ec values?
Edited by TheWatcher, 05 May 2012 - 01:36 PM.