Hey there miss, can I ask u to go check the canna feed chart online again please? I just googled it and it seems to say 15-20mls per 10 ltrs. So im assuming when u put the nute levels your using, u put the wrong amounts down.
Please tell me your not using 20 mls per liter of nute mix. ur plants look ok so im guessing your not, But just wanted to double check. Anything over 5mls per liter on anyones nute mix scares me and makes me want to double check they have not just made a typo.
if your using the 20 mls per 10 liters like the web chart says, then change your nute mix in your diary to 2 mls per liter. u can do this by editing the week.