Give them some type of liquid fertilizer that will directly feed the rootsHere a full pic
Also are you ph'ing your water ? Nitrogen can't uptake if the ph is below 5.5 and over 6.5 so 6.5 is preferred... I'd give them some nitrogen ph your water and you should be fine but honestly clones do that at first I think it should bounce back soon and start growingI started freeding them this 2 weeks back they all improved but for some reason this one is lagging
Also are you ph'ing your water ? Nitrogen can't uptake if the ph is below 5.5 and over 6.5 so 6.5 is preferred... I'd give them some nitrogen ph your water and you should be fine but honestly clones do that at first I think it should bounce back soon and start growing
You need to know which medium OP is growing in before giving pH advice. If he's in peat or coco or some other inert medium, maintaining a 6.5 pH will become very problematic.
I am using a peat mix black majic
That stuff is coco and peat. You need to maintain a pH range of 5.7-6.2.
Due to the fact that it's coco and peat mixed, I'd highly advise that you periodically swing the pH. Start at 6.0. After a couple of waterings, 5.7. Couple more, 6.2. Couple more, back to 6.0.
Do not pH all the way up to 6.5.
This will ensure maximum nutrient uptake availability.