It does look like a young/small aiptasia. I use joes juice on mine, but with yours so close to the zoas I don't know if it could hurt them. From all of the pictures I have seen aiptasia can come in quite a few color forms.
Thanks for the input guys. Sounds like you believe it's aiptasia for sure and I should get rid of it, I had this bad feeling it was. I will take the extra care of the zoas and try to nip this guy out with some joe's juice.
Any other opinions are still welcome?