How can you tell the difference between the two. If I had to guess I would say Zoa's. The polyps are not that big maybe 3/8's tops. From my experience paly's normally stand taller. These are a very short polyp. If that makes any sence.
The height of the polyp don't matter, I have some that the paly is tight against the rock but the over all size of the polyp head is what I am looking at. I have a couple PPE that have extremely short stalks but the head of the polyp is 2x the size of a zoa polyp head......From the comparison pics they look about the same size polyp head as the LoEs.....If you think about it 3/8'' is close enough to a 1/2 inch which is a large polyp head where as most if not all zoa heads tend to be 1/4'' or less....Though it is not a hard and fast rule....