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these do appear to be white zoas, belonging to the protopalythoa (palythoa) group of zoas. anyway they stay open at night because they are continuing to feed. zoas (and many other corals) contain zooxanthellae, unicellular algae that gives the coral their color and also provides energy for the corals much like a food source does. since the white zoas do not contain these little algaes to give them color (hence the white color), or provide extra energy for the coral they must feed on food in the tank. I could go into much more detail about this whole topic but this post is long enough already i think. hope the info helps.
Last edited by sucker_fish; 06-27-2009 at 02:36 PM.
Reason: added info
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