It is a very high possibility it could be potassium with what you just described. It is always hard to see the subtle differences in colors here, especially when there is the HPS lighting in the background. Too much N will cause that as well. Best to check your ph soon and cut the N almost completely out at your stage of grow. If the ph is jacked up it doesn't look like it has been for long because your plant still looks pretty healthy. Get back with on here as soon as you get a good ph reading and post it up. I will let someone that has experience with coco help you from that point. I have never run it and at your stage I wouldn't want to steer you wrong.
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Yes - good call Ska'd! I would be at 5.8 at this point in time.
Here's a handy way to calculate your coco ph
Rough Calculation Guide By GoAuto6:
Here's some good info on ph.....
If your runoff pH is higher than your starting pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference
If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.
For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5
If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5
So, this means if you are watering at 6.5 and it's coming out at 5 .. your coco PH is 3.5
... that can't be right >.< wayyyy too low
I would check again. Just catch the very first bit of run off.
I water at from 5.6 at the beginning, and slowly swing it up to 5.8 at about your stage, by the end i'll be at 6-6.1
I use canna coco plus - it's awesome and you can just pop it in a pot with some perlite and add water 5.6-6.1 and thats it.
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Hello peoples the big girl in the back is my white dominia in her 6 week of flower has 6 more to go but have a feeling she is going to go longer as she has not stopped gaining height and the buds are still very small . The moby dicks are at 15 days on the left and 18 days on the rights hope you enjoy the pics sorry for the colour I dont have natural lighting near the tent :stylez rasta smoke: what up Clix ....just stop by to see how it going ...:smokebuds:looks like coco is takes some turning ...but we will get it there ..i'm sub'd