Quote:
Originally Posted by Reefer Rob
Don't you find that when you have more polyp extention it happens at a time when your corals are growing well and have their best color? When the polyps are retracted on a coral in my tank it's always when it's not happy.
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Polyps on an sps coral are there to catch food, usually there is more food in the water at night which is why you get better night time extension. If a coral is hungry and/or if there is food in the water it extends polyps to maximize food catching potential.
A coral that wants to eat is healthy, a coral that needs to eat because it's not getting enough food from photosynthesizing is not