BTAs

[Snappy]

Mine hangs out about mid-height in the tank.
I have no idea about the moon phases and their effect on my BTA. My current lighting is an AquaMedic HQI fixture with 3x250 10k / 2x150 20k and I run 2x 1watt blue moon lights during all but 2 hours of the regular lights out time, however the BTA has always been bubblely even before I changed my lights a few months ago. Sorry, I don't really know what makes them tick. The RBTA of Ryan's is a clone of one I had that seldom had bubbled tips but it's offspring apparently does in Ryan's tank. For me it's a mystery.