A few things, the anemone is massive... last time I measured it.. it was over 26 inches across. Its grown since then, also it appeared to deflate.. which isn't a good sign...it was like that for a day. Upon closer inspection after it return back to normal... there is a visible line crease running through the middle of it and through its mouth.... It might be a thing it might not.... but the signs are pointing in that direction.Just curious what makes you think it will split soon? I have had mine since 2016 and looks and behaves a lot like yours.