MT79
Aquarium Advice Addict
If it is just floating around I would place it somewhere w/ low light and flow w/ something to attach to such as a piece of LR. As Lance said, if it continues to drift around that is not a good sign. As said light acclimation can be very stressful, especially when going from lower to higher light conditions. I would highly recommend using the screen method to photo-acclimate the BTA. HTH and good luck.