If you plan on upgrading to MH
soon it would be best to not add anything until the animals you currently have are acclimated to the new light. A lighting increase can be very stressful on coral and anemones and may cause the LTA to wander. That would increase the chance of the LTA and BTA running into each other and going to war. The stress of collection/transport to the LFS
, to your tank, coupled with a lighting change soon after may be enough to push the RBTA over the edge, as well.
If you decide not to upgrade to MH
a BTA should do ok w/ your current setup. Good luck