<a href=showthread.php?s=&postid=7455654#post7455654 target=_blank>Originally posted</a> by jreimer
bboy aqua,
By reproduce I guess you mean asexually - if they are Zoanthus they will bud and alsosometimes naturally split into two colonies over time.
If you are talking sexual reproduction (!) they would most likely spawn at night after a full moon (maybe a couple days later) - based on tides etc., usually around 9 pm to midnight - and each colony would be hermaphroditic (sperm and eggs both from same colony) - each polyp would contain either only eggs or sperm. Not much research on this out there, so we can't be sure species to species or even location to location - but there is some info - let me know if you want any pdfs of papers on this.
cheers,
j