[Delphinus]

BTA's don't really change colour. If it's one colour then it typically stays that colour (although the exact hue may differ over time due to differing conditions). Brown is pretty typical. They're brown even in the wild. The only ones I ever saw in the wild were brown. (Although they can come in reds, pinks, oranges, greens, maroons even bi-colour varieties). In shallower water I found more with "bubble tips" and in deeper water less so. I think this makes sense, if you look at the ratio of surface area to volume of a sphere compared to that of a cylinder or cone.

Considering that you likely have your anemone under very intense light, Chris, this would be my guess why yours stays bubbled. However lighting is not the be-all-end-all answer to why they bubble up sometimes and sometimes not. Ultimately it's still a bit of a mystery. I've had clones right next to each other where one would bubble up and the other not.

Chris how big is your BTA? Have you had it long -- or has it split recently? What and how often are you feeding it?