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Im doing my 2nd grow in coco and since ive started feeding them one plant started to yellow about a week ago, i flushed it and 2 days ago another strain started getting yellow tipped leaves. There is not much sign of improvement since i flushed it and i will post some pics as i dont know if it...

I have a 400w HPS light which i got with a 400w ballast. I notice my plants aint vegging to well under the HPS. Im wondering if it would be possible to change the bulb to a 400w CFL for vegging? or would i need to buy a new housing and ballast for the 400w CFL? Your help would be much...