Snails, snails and more snails... Nassarius Snails, Margarita Snails, Cerith Snails , maybe some Astraea Snails, and some Nerite Snail. Add a couple of fighting conch too.
Some will tell you add hermit crabs. I don't put things with claws in my tank anymore. The hermits (blue and red legged) always went after the live snails for their shells, even though there were plenty of empty shells around.
Pepperment shrimp are great for the smaller aiptasia but won't eat the larger ones. If you use Joe's Juice, make sure you turn off all your water movement as stated above and hit them in the mouth. The larger ones may have to be hit a few times.
Age is relative, you are only as old as you act....of course, this works in reverse....