Is this a polyp?

One of the main differences between zoanthus and palythoa is palythoa incorporate sand into their stalks in a tissue called coenenchyme.

 

Will that make any differance in the care of them or fraging in the future?

 

Usually not, Just wear gloves and Eye protection when fragging these corals.

On a side note the only other thing it could possibly be is a Majano Anemone, which are generally considered pests. Because these guys are so new, Just keep an eye on them to see if they start getting a more bulbus tentacle. But Im pretty sure they are Palythoas (Button Polyps)

 

I would say they have been growing for about a month and a half to 2 months, the tentacles have not changed other getting longer as the "polyp" has grown. I have had 3 spring up on the same piece of live rock and now the 2 larger ones are have 2 new heads growing from their bases.

 

Some one pointed out the difference between zoa and palys. They said palys always appear to have a dusting of sand on the stalk and that zoanthids growing in a mat pattern where palys have individual stalks. I do not have a lot of either zoas or palys, but it seems to hold true for what I do have.