When BTA's split and new clones are produced, especially in a cluster, I have 10+ rose tips, flame tips on 1 rock and other forms(purple/flamethrower/and green close by to this, however when they are in a close group formation they will not kill one another, they will \"push out\" smaller anemones which forces them to move. I usually harvest 2-3 rose tips every 8-10 weeks out from there. i just place lace or porous rock nearby, then pull out the rock with clones attatched. The thing is when they are all packed together as Duke mentioned they cannot expand to their full potential. But if they are in aplace where they are happy i would leave well enough alone.