:thumbsup:
Yes, they will use the extra energy to reproduce/grow.
Also, depending on the food you offer, the colors will be improved.
Target feed them once a week small amounts of dry coral food. Turn off the pumps and make sure the fishes won't get on the zoas' food. If you feed at night, the polyps are most of the time extended and fishes aren't as active (unless you have some nocturnal species, of course).
Target feeding helps to maintain water quality, once the food aren't all over the system and goes directly to it's destiny!!
Please search for threads about target feeding the zoas for more info...
Good luck!
Grandis.