More then one BTA

Hello,
Nothing is guaranteed, and I don't know too much about your setup, but they are a hardy nem and it sounds like your environment is working for the one you have.
 
It is generally safe to keep multiple nems of the same species together, but always a gamble to some extent.

Personally I would hold off and see if your BTA continues to do well...a staggering number of captive anemones die before reaching two years.
 
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