Norm, in the 12g tank my RBT migrated between the same daytime spot and nighttime spot for about 6 months. That is, it moved daily up and down on its rock (actual pedal movement observed), but never strayed from those two spots. The color was always great but the anemone did not bubble at the tips (as Norm observed). I ran 2 50/50 bulbs on the tank. It did sting several hairy mushrooms to death.
Sadly, last week while we were out of town the tank crashed. I don't know what happened, but electrical was involved as the lights failed to come on one day and the water turned black (according to our house sitter). I lost the anemone, cleaner shrimp, snail and a number of worms. Anyone looking for a pair of false perc clowns? I could put them in the sump at the RTC tank but otherwise cannot add them to that tank as there is already a pair of Sebae clowns.