Fresh2o
Aquarium Advice Addict
I have had 3 broadleaf chain sword plants for 6 months now and not one runner yet. Maybe just dosing glut is not enough to produce runners ?
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I started with low light and they barely stayed alive. Switched to a better light (Finnex FugeRay) and the growth improved. I was dosing Excel and Comprehensive. The greatest effect came from the addition of DIY CO2. Took about 6 weeks for the growth to really take off. It was producing several runners a week. And when I only kept a few plants and clipped the runners, the plants responded by growing tall. Several leaves reached the top of my 20g long. I eventually removed all of them because they became too invasive.
So, CO2 is the way to go.