It's not light intensity, I definitely agree with that. Is it non-limiting growth from stable nutrients? Is it low nitrates? Is it stimulating carotenoid growth through specific spectrum?
I have a tank with EI going and sufficient light/co2 for good growth. The plants grow fast, they are healthy, algae is low, but they do not turn red. I also have an aquarium with low light, poor nutrient balance (but plenty of nitrates) no added CO2 and a little fluorescent t-8 managing 1.5wpg. Rotala turns red when I move it from the good quality tank to the poor one.
Is this one of those currently unanswerable questions? For all my efforts looking, I have yet to find a definite answer.
-Philosophos
I have a tank with EI going and sufficient light/co2 for good growth. The plants grow fast, they are healthy, algae is low, but they do not turn red. I also have an aquarium with low light, poor nutrient balance (but plenty of nitrates) no added CO2 and a little fluorescent t-8 managing 1.5wpg. Rotala turns red when I move it from the good quality tank to the poor one.
Is this one of those currently unanswerable questions? For all my efforts looking, I have yet to find a definite answer.
-Philosophos