Single Boseman Rainbow and Pristilla Tetras. Stress? Agression?

Pristellas can be shy, especially under bright lighting. I had my 6-pack in a not-so-brightly lit, planted 5g. They were front and center most of the time (as if they had a choice). Now that they're in a heavily planted, better lit 46g tank, I don't see as much of them. They do come out from time to time, but they seem to prefer the darker areas of the tank and they do try to stay away from my (butt-head) DG...
 
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