I am again taking crappy pictures at night after lights out, but wanted to share this, since I have two different BTA's. ( I am mostly just posting these for the appearance differences, they also exhibit color differences, although under the same lighting)
One, my original, spawned ButtUgly. Notice the elongated tentacles. They always have been, I really don't recall bubble tips even under the 2 X 250w.
This one is a BTA as well, but much different, I didn't use the flash there.
All under 175w MH and in the same tank in identical conditions.