From what I have read, and I'm a newbie, pearling occurs because the water has become fully saturated with oxygen. Since oxygen can not be dissolved in the water, air bubbles, the pearls, form on the leaves of the plant. In order for oxygen to be released by the plant, photosynthesis has to be occurring. Photosynthesis requires light. So based on all that, sounds like your set up is working. Are the tubes good for your plants? I dunno. I suspect that more light would trigger more photosynthesis, making more oxygen, resulting in more pearls.
55 g ~ 404 Fluval Canister ~ 110w 6400k photoperiod 8 hours at the end of the day
10 g quaratine/hospital