<a href=showthread.php?s=&postid=15398783#post15398783 target=_blank>Originally posted</a> by catman78
I've had hydnophora in prior tank. Shape was different and polyps were soft and extended.
Coral pictured has no visible polyp extension. It's quite smooth and is growing in a plating manor. There is no verticle growth from surface.
hydnophora will start budding upwards.