BTA split?

[booduh]

This is the second BTA I have ever had, the first one is still alive and well for over a year at the other end of my tank. I have had this one for about two weeks, I know what you are thinking, it is a little pale, but it will be fine.
Lighting - good 2x150 watt 10K metal halide with 2x90 watt actinics
Tank - upgraded three months ago to 80 gallon
I have never had a BTA split on me is this the start of the process? How long does it take? This one has been like this for about a day.
Any help would be much appreciated, thanks!

 

[clown123]

that a pair of marroons there nice. so is the anenome

 

[clown123]

i dont think it is slitting bc mine always does that it split once but i didnt get too see it wich rlly stunk.