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To add onto what Jay said. I've experienced similar things with my tanks.

Taking wavelength and energy into consideration with the way light is diffused in water it makes sense that light higher in the blue spectrum would encourage plants to grow "leggier". As one goes deeper into water more spectra are removed by the water until only blue is left because it's higher in energy. Plants grown in high blue light would tend to react to that by trying to grow as tall as possible as quickly as possible, resulting in longer internodal lengths.

You can also get the same results by growing plants in nutrient poor water under high light. I've got some of that going on in one of my tanks right now.

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