its not mite damage i've had mites on a previous crop very devastating so i know what to look for now and its not a bug problem my room is always kept very clean i always pick up any dead or fallen leaves remove the plants weekly and give the room a thourough cleaning i am fairly positive that it is magnesium deficient as canna bis uses quite abit of it and not many fertalizers contain enough of it this happened also early in the flowering cycle i used abit of epsom salts 2 tsp per gallon and it seemed to stop the progression of leaf damage
anyways i have new pictures from today day 44 of flowering ive just started to flush with just plain water hope u all enjoy te new pics