Hey coreywebster,
Plants are about 18 cm from the light maybe they could do with a feed I haven't really had a feeding schedule but now they have started 12/12 2 days ago would it be to early to give budding stage nutes? The coco coir has added pH but I'm not sure if after a few flushes it would. How can I up my pH?
Hey man, Coco buffers well so feeding it higher PH or lower will adjust the overall ph of your coco.
I was asking when your feeding what ph your water is so that we can all help diagnose the issue your having. So your ph is the acidity of your water, in Coco feeding with coco nutrients you want around 5.5 to 5.9 ph value. If its higher then your plants can not absorb some nutrients, for example calcium and zinc.
And the reason I asked what water (tap,well RO) was just to try and rule out a few things, since tap water usually has reasonable levels of micro minerals like iron calcium magnesium ect, RO water doesn't have those so know that helps diagnosis too.
I will add a chart which shows the best PH ranges for certain nutrient. It shows Hydro and soil comparison. Coco is considered Hydro so look at that side and hopefully you will see what I mean.
As for your light.. I would raise it to about 18inches instead of CM.
It could be a number of problems, to me it looks like a N deficiency but the curled down leaves made me look at all possible options. Plus a N deficiency usually shows massive yellowing on bottom leaves rather than across the whole plant evenly.