tmz, do you even know what you just said? they dont show a feeding response? thats bull!
Water Tecn,
tmz is right ,imo.You might be reading into his response to much.Zoanthid refers to protopalythoa,palythoa,zoanthus,and a hand full of others I cant spell without looking it up.In short though it covers the 3 above whitch most aquarists would be talking about,I.e.-(Zoa's & paly's).
Problem is ,theres no clear cut way to Identifying them down below that.To do so would require a dna analysis,from my reading anyway.
Some folks think they can tell by certain characteristics,that maybe true,to a certain degree,but theres still many examples that dont fit.Heres some of the common ways I ve seen people use to identify.
1)" They're zoa's If they're small they need more light and dont feed.Not exactly true,Tubbs blue actually do better in less light and will gain a green to its skirt,ime.
2)"Dime to nickel in size ,they feed so they're paly's".
I dont think this fits either,Armor of Gods are the same size as nuclear greens /pink& golds and purple deaths.
Pink & golds do well in bright light showing better coloration and accept direct feeding.Armor of gods do well in bright light,but will not accept direct feedings ,ime.
The other 2 purple deaths,Nuke G's will both feed ,but do better for me in less light. Theres many other examples that make identifying a guessing game imo.
Palythoa-from my reading on identifying is suppose to lack stolons or runners and are suppose to resemble polyps that have been shoved into a 1/4-1/2 " mat lacking the "stem" part protopalys or zoas have. Ever see ARC
Tiger lily's?Sold as palythoas , they do seem to fit the general description but have the vine like runners (stolons).Doesn't quite fit either exactly,imo.
Eric Borneman & Charles Delbeek have both stated a general rule we should go by.The smaller the zoanthid "usually" the more autotrophic,light dependant.The larger ,its likely less autotrophic and "may" accept feeding.They both state repeatedly it should be used as a general guideline noting the variations and the difficulty with identities.
Fwiw-there is a study showing 1 coral meeting 1oo% of its needs through photosynthesis alone,I believe it was a sp.of zoanthus. Thats the only one Ive ever heard of though.