first grow

@BigDaddyK, It may also be the clay pebbles because i read online they increase the ph of the water. I always make sure to mix the reservoir well after adding nutrients or ph down. The new leaves are looking better now so I hope it was just a problem with the first res fill.

@pineapple99,ok the only thing I can think of is when you added the rhizotonic , I think it puts the ph up . Or if you put ph down and it went yo low ,maybe it had a hot spot , who knows , hope it fixed 👍

@BigDaddyK, they all get fed from the same reservoir so it's strange that this is happening only to a few plants. It's only the oldest leaves that have the brown patches. The new leaves look green and healthy. It may have been a problem with the ph before I replaced the reservoir a few days ago

@BigDaddyK,this is why I think hydro could be very risky.

@JUNGLE_B4RNS,I had this issue late on , it's definitely Calcium , but it's whether it's lockout or deficiencies, my one was caused by ph 8 , then air pump failing , due to power cut , it never resolved I was lucky it was week 8

@BigDaddyK,I’ve had exactly the same symptom with this crop on the same early stage, I’m suspecting Cannazym, like if the formula was different. It has stopped like it has come, idk how... 😐

@BigDaddyK, I've been keeping the ph between 5.7 and 6.3

@BigDaddyK, I'll do that when I empty the res next week. And thanks for taking time to help a new grower I really appreciate it

@pineapple99,also you don't need the cannazym in yet , I would do 0.5 ml of rhizotonic per litre

@pineapple99,yes but not pure

@BigDaddyK, I have the lights around a foot away from the plants

@pineapple99,how close are they to the plants ?