I bought some Xenia from the LFS last week. This morning while cleaning the tank I noticed a hitch hiker. Is it Aiptaisa, if what is the best way to get rid of it?
It is aptasia, inject it with Joe's Juice or Kalk paste. Make sure you don't try to manually remove it as you may end up spreading the spores around the tank ending up with more. Peppermint shrimp work well for aptasia control as well, but they are a bit hit or miss when it comes to tackling aptasia especially if one is large in size. HTH and good luck!
The above mentioned are great ways to kill them, there is also a product called aiptasia-x that works pretty well. Make sure to shut off all pumps for a while when using it.
I have also had luck with Liquid Calcium. I shoot it with a syringe. I also have mixed up kalk with water to make a thick liquid and shoot that with the syringe...just my 2 cents.