I just put this frag with GN in a few hours ago , and this is what they look like , the Hrrc (left velvet green) , a few zoa tips are they need time to acclimate to dif lights and if they are not getting enough of the right spectrum they will "stalk" up on you see how my guys lay flat , this in an indicator that they are getting the correct amount of light . the frills stay short and fat in lower flow and get longer with higher. I shoot for about 50 - 200 Par on zoas in 12kfor 8hr and 20k 4hr then lights off. hope this helps with your zoanthid care , and a little work goes a looong way with these guys , happy reefing !!!