I've seen wall to wall BTA's in a tank that size before (nothing else in the tank). I'm sure another would be fine.
I've had a RBTA for many years. Never once split on it's own. I've always cut it to get another. It's been in quite a few different systems, different lights, different tank loads, never split. It has changed appearance as for bubbles and color from system to system/lighting, but never split.