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    Default yellowing leaves in coco please help

    hi everyone im a newby to this site so please be nice lol

    my problem is that i am growing 13 plants (i know not a good number to start with) they are all in canna coco. I vegged for 3 weeks under 1 600w duel spec then switched to 12/12 then added another 600w duel spec, i have a big isolating fan and a primaclima climate controller that keeps the room 27 degrees, the room is 1 meter by 2 meters. The plants are in 2 gallon builders buckets with holes drilled in the bottom. Im using the full canna range, canna coco, canna coco A & B, rhizotonic, cannazym, PK13/14 and canna boost.

    i fed the plants once a day with half strength until i noticed leafs going light green then i increased to full strength and always kept the ph at 5.7-6.0. Now im starting to get worried my leaves are going a uniform light green/yellow just under 4 weeks into 12/12 light please help
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