What is your best Aiptasia muncher?

[Willito]

How do you distinguish which peppermint is the real macoy? This maybe my problem in the past, not obtaining the right specie. Maybe you have a few pointers to how I can identify the right one for the job. what should I look for in terms of appearance wise.

I know which specie to obtain, just don't know how to differentiate them apart without having them both of the readily availble in the pet store.