The truth is that know body really knows. None of us hobbiests and none of the scientists.
What you have heard is all speculation dertermined by owners and their thoughts.
There are bta's in tanks with low and high lighting and the nem is not fed, but yet still no bubble tips.
I have mine in dim light and did not feed, no bubbles. Also in high light and did not feed, again no bubbles. And then I kept in in high light and did feed, still no bubles.
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new lights may help they may not. the thing is that its just totally random. sure it may have bubbled under one light and none under another. but i have had bubbles in the same tank under same lights in the exact same condition for years and seen them switch back and forth between bubbles and no bubbles. some say they bubble when you feed them, some say its light, some say its water quality, some say its if theyre being hosted or not.