From the pictures, they both look like BTAs to me. Not all BTAs have bubbled tentacles all the time. In fact, mine doesn't hardly ever. From everything I've read, no one is sure why they bubble or why they don't. Could be lighting, food or water flow. Thing is, mine sometimes bubbles...sometimes doesn't....but I've never been able to figure out a correlation with feedings or flow. Never changed lighting so that could be it.