Sure looks like aiptasia to me.
I've all but convinced myself that Aiptasia X is nothing more than a slurry of calcium hydroxide in water with a little coloring thrown in to the disguise the formula. I made a calcium hydroxide slurry in water after numerous attempts to use Aiptasia X, and lo an behold, it behaves exactly the same way! :)
Also, be prepared to apply the paste or Aiptasia X more than once as the anemones get knocked down, but they get back up unless you hit them again and again. Just my two cents.