Troy, I wish I could impart a fail safe recipe for success here. Mostly patience. It has taken a couple of years to get the spikes. I did recently change up my approach. I am now growing most of my phrags with a constant moisture feed (4' flood table with the bottom 1/2" of the pot in the flowing water, fert 3 times a month and they get fairly bright light.
I use four foot hydrofram t-5 ballasts with two 6500k bulbs and two stock.
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