so i did a res change last night .... 60 liter 1ml/L vitalink silicon 1ml/l vitalink cal/mag 18ml floranova grow 10 caps full liquid seaweed ph/d to 6.0 wake up this morning it's at 6.8 aLOS LOADS of issues with the leafs
Looks like nute burn ( looks old ) But also looks like roots are rotted ( brown ) , do they smell ? is this why you did the res change ? also this one spot looks to be from pH fluctuations . Check your pH meter first . https://forum.grasscity.com/attachments/img_20160823_174751-2-jpg.2184495/
i'm not sure if the roots are just stained as they don't smell no slime and they don't pull away my meters always calibrated no i did a res change coz your meant to change it every week