How to get a RBTA to be bubblious

Luck.

No one has been able to come of with a "trick" that works the majority of the time. Back when I kept them I tried;
Less light, more light.
Less food, more food.
Hosting a clown, not hosting a clown.
Low flow, high flow.

The results were always the same -- long tentacles.
 
I've taken one out of my main tank where it didn't have bubbles on its tips and put it in my nano and it got bubbles on its tips. then a couple of months later it went right back to no bubbles.
 
My RBTA had bubbles when I purchased it. It was in a frag tank with bright Halides. It moved to my temp/small tank at home with T5HO's over it. It is healthy and happy, but less bubbly. The tentacles did however become a bit longer (thus losing bubbliness) in order to give itself more area for photosynthesis. It will be going in to a 125gal halide lit system in a few months time. I am hoping it bubbles back up then.
 
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