Ok so yeah I hear that about the damage on the lower leaves being like that at the top so that a good indication that its not the lights.
I have just thought something, a couple of weeks I was told multiple times I had fed them too much N and yeah the plants had dark leaves and was pointing to that and I looked at the canna A and B dosage and I was feeding the same amount of both in my daily watering, this problem started easily 7 days ago and 5ish days before that I left canna A bottle out and have used just the B bottle as the A has all the N...its obviously the reason for this..
Tomorrow (Monday) I'm going to water with both A and B.. should I use the same amount of both or slightly less A?
Thabks for the replys