Hey guy had my PBTA around 8 months now did post with pics when it went in. Its never bubbled just been quite stringy in the tenticals, looks really healthy and opens up quite large and feeds well. I recently dismantled the wall to took a lot of fish out so decided the reposition it in the tank, it has previuosly been located under the 14K and 20K bulbs either end of the tank but now its right in the middle under no direct light. Almost straight away have noticed a difference, under the halide it acts the same. But under my 2x54 watt T5 actinics the tenticals really shrink down and are begining to look like its bubbleing.