Black blotches appearing on side of leaves

[Blue]

What's the crack with coco and feeding do you guys feed every day I feed till runoff, but I have only been feeding like once every 3 days, I'm pretty new to this

Feed everyday to re-oxygenate the rootzone. Once every 3 days in flower will lead to salt build up as the medium drys out

[Krazysmoker]

Feed everyday to re-oxygenate the rootzone. Once every 3 days in flower will lead to salt build up as the medium drys out

Good info I see what your saying, seems strange I only have it on one of my plants, do you think I sould flush all 3 anyways

[Krazysmoker]

Also do I have to use 45lt to flush coco seems a lot haha my fabric pot is 15 lt

[Blue]

Good info I see what your saying, seems strange I only have it on one of my plants, do you think I sould flush all 3 anyways

Without pictures it's just a guess, pics of the plants will tell a lot more.. It may be something easily corrected without a flush.. And yes around 40 - 45L will clear the medium