Purple stems on the Fan Leafs

It's like you hit them with a nuclear fertilizer....who knows maybe they'll pound out some weight.

I do work with Nuke Gauges.. Hmmmmm. a little sprinkle might be just what they need.

i've been feeding on canna bio vega for two weeks and now switched to 12 hours the large fan leaves are dark green and reddish in the stem.they are really healthy looking apart from the above. defo not an overfeed problem as i've taken care to not do so. also the tops of 2 of my babies have gone slightly droopy. grow shop guy says maybe it's because of recent cold weather. i disagree as the room temp never gets below 62f. i used bio rhizotonic from clone too. going crazy trying to solve the problem don't need this problem at start of flower. HELP!

From what I understand, you are on the right track. Flush and flush again.
Come back with 1/2 strength soup and look for improvement.

Looks to me like Nutrient Lockup...this happens when one or more nutrients is at a very high level compared to the others. Too much of one wont let the plant take up others. This is also eminent with PH..If your pH is true high some nutrients wont be used and vice versa. At 6.5 to 7.5 all nutrients are available to the plant. If you start getting to Alkaline nutrients like Iron,Manganese,Phosphorus,copper,zinc and boron will become harder for the plant to use. If you get a more Acidic Ph Phosphorus and Calcium and Magnesium become restricted.If the Ph is too low (acidic) manganese can become toxic. Just some examples to help explain it a little better. Also soild high in Salts can restrict water intake resulting in droopy leaves. Hope this info might help...