Originally Posted by PerfectDark
Its an online FAQ about all types of anemones, information was taken from "Anemone Fishes and Their Host Sea Anemones" by Fauntin and Allen.
Specifically: "BTAs are also known to split when stressed, and the most
successful way to get a BTA to split via stress is to feed it heavily for several weeks, then do a large water change in your tank."
I dont condone this method however its been proven to work according to the article.
As I suspected... stress related.
While I like BTAs for aquariums as they can be maricultured easier than other anemones, I'm not sure stressing the heck out of a critter is particularly ethical.