Porites Coral vs Zoa

[Crazyfingerz]

I have a couple of porites coral growing among some zoa and they seem to be doing very well. but on some other frags it seems that the colony of zoas are stinging the porites coral and causing it to die. i dont attribute this really to lighting because all the porites are on the same level. what do you think are the zoas really stinging the sps?

[reefsurfing]

I didnt think zoas could attack sps but it wouldnt be the first time I was off in left field.