My girlfriend's got 440w of VHO and I find that all zoanthids that come out of my tank (800w 20k mh and 220 vho actinic) and go into hers shrink to about 1/3 of the diameter and the colors/patterns become somewhat muddy. That said though, they all grow, so you'll probably be able to keep anything. Look for palys if you want larger polyps.