Dunno bout the regular minis, but secrets to multiplying the red ones:
1. Keep pH at 8.2 at all times, do not waver
2. Must be at bottom of the tank under 20k lighting
3. They prefer black, or black-and-white mottled sand
4. You must supply exactly two sexy shrimps per anemone
5. They only eat cyclops on Tuesdays
6. Sing to them before bedtime
7. Never, ever let on that you look at the other corals sometimes
.... or just stuff em as full of food as you can every day, they're exceedingly good at turning mysis into more anemone in a hurry.