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.