How do I know if I have palys or zoas?

[timmyrules]

Hi guys, a little while ago I bought a rock that had some anemones on it. It also apparently has some coral on it, but how do I know if I have Zoas or palys? What is the difference between the two?

 

[BudgetR33f]

Palys are usually a lot larger, seems like zoas to me

 

[FUNGI]

Generally speaking, Zoas have smaller heads that grow very closely together and Palys have larger heads that may be spaced slightly further apart.