[mike31154]

Not providing much info on the nature of your filter change. You say you "had to remove all my media", so what media were you running and why did you feel you had to? What media are you currently using? I also use a canister on my sumpless 77 and have a GBTA with one clone hosting a Maroon pair. The only thing that has gone into my canister for the past couple of years is a bag of carbon which I change out once a month or so. Other than that, it's just a mini sump and provides a bit of extra flow in the center of my tank. My GBTA has split a number of times & the clones have always done well, in fact I tore the last clone trying to get it out to sell to another member a few weeks ago. He got the larger piece & I had this little shred that was wedged too far into a rock crevice for me to get out, that's how I ended up tearing it. A kind of accidental, forced split. In any case, it's pretty much fully recovered now & has moved more out in the open. All clones from splits have remained very close to the original BTA. I think BTAs can split for various reasons, maybe stress, but I'm sure I've seen many threads of owners with perfectly stable & healthy systems having their BTA split. I have trouble wrapping my mind around the idea that inverts such as anemones can even experience 'stress' as we know it. Water change will probably be a good idea.