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Oh that changes everything,why would you mix soil and coco, it's two different types of growing medium require different pH. Coco is 5.5-6.3, Soil - 6.3-6.8. In coco you need to water a lot more often. For this case, I would use liquid silicon to raise the pH. Follow the schedule (Day 1 feed...

most base NPK nutrients lower the pH, what do you use, to bring the pH up?

You shouldn't flush when growing in soil, you disturbing natural processes. Don't water it until 2 inches of your soil will be dry, or when your pot is light on lift. If you want to test your soil pH just take some soil sample (handful) and soak it in 7 pH water for 24 hours, than take pH...

This is pH problem. Did you take pH reading before watering your plants and of collected run-off?

The way coco works is different to soil. Here's official canna website, they provide full info on how to use coco http://www.canna-uk.com/using_canna_coco Read this and you will understand what I mean, they explain it way better. There is another method, when growers follow next schedule, day...

Order TDS meter as well, they are very inexpensive.

that's good, from tomorrow start giving it 0.5ml/L of canna a and b, as soon as you get cal/mag start adding to your feed at 0.25ml/L. For a week feed it once a day. Than do one day feed, one day plain water and don't forget to keep the pH at 5.8, for pH down use phosphoric or nitric acid, for...

I would flush as soon as possible, but if you leave it till tomorrow it should not do any irreversible damage.

Why do you need to prepare water, why not straight from tap. If you can drink your tap water, you can give it to your plants. Just buy TDS meter from ebay for around 10 baks and you will know exactly what's in your tap water, and how hot your run-off

Yes I am sure, flush them now,after that flush don't water them for 3 days, and than start daily watering scheduled(one day water one day food).I believe you have not used flushing agent for coco to clean all salts from it before potting your plants in it. If you want to avoid all this pain, you...

I had some experience with canna coco, and I always had to add cal-mag. Anyway what's more important is, 2ml/L is way too much for autos. I had some left over canna a and b, a diluted 2ml/l of each in litre of water and took PPM readings, and it's 655, this concentration must be at the middle of...

You don't use cal/mag?

Can you provide full list of nutrients and additives.

what PPM concentration of nutrients did you feed them?

Preferably. Some salts in rockwool are hardly soluble in cold water, you can try to increase solubility by placing the jar with soaked rockwool on the heat mat. Keep on checking for changes in pH, once you notice a change, place the rockwool in the fresh pH'd water. Do this until pH will remain...

rockwool needs to be soaked in flushing agent for 24 hours, than for another 24 hours in 5.8 pH'd tap water. keep it on the heat mat for maximum 3 days, under the dome to keep it from drying out.

COCO is very hard to overeater, the oxygen ratio to water is always greater as long as you have a good drainage.

For sure 300 watt cfl will do 2 plants fine, but yield of each plant ill be reduced, depending on the strain, there is a big chance that finale yield of both plants will be greater then yield from 1 plant. I would recommend spread all this watt between severely light bulbs to get maximum from...

water until you see a little run-off. 300 watt cfl, gets quit hot, so keeping it too close may hurt the plant, put your lamp as close as possible, but dont let temperature between lamp and the top of the plant go beyond 30C.