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Old 04-07-2007, 10:18 PM   #1
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Question about corals

i would like to know why corals hide at night. i have a plusing xenia, torch coral and toadstool leather and all 3 hide when the lights go out for about 2-3 hrs then come out? is this for safty?
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Old 04-08-2007, 02:43 AM   #2
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Corals expand primarily to feed. When you see them open during the day, essentially that is why they are open and that is what they are doing. The more inflated they are, the more access to light they have and the more light gets to their zooxanthellae, which is the primary food source for most corals. The opposite is true for most stony corals, that feed at night. When the lights go out, there is no need to stay expanded because there is no light to gain energy from.

Hope that makes sense.
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Old 04-08-2007, 02:48 AM   #3
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Couldn't have said it better myself!!!
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Old 04-08-2007, 01:48 PM   #4
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cool so does every ones coralsdo that? i have a toadstool and in the morning takes a few hrs to come out. thats great info. thanks i will kep that in mind. mabey my nest coral will be a stoney one.
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Old 04-08-2007, 02:09 PM   #5
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My Xenia, Green Star Polyp, Mushroom, and Elegance all "sleep" at night by tucking in. So I am under the impression that is what will happen every night...
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Old 04-08-2007, 02:25 PM   #6
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That sounds about normal to me...temp swings will effect your corals too...keeping a constant temp be it 78 or as high as 82 consistancy is the key....
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Old 04-08-2007, 04:31 PM   #7
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well yesterday my toadstool opened up about 2 hrs after the lights came on and today its been about 6hrs and still he has not opened up. i dont know if hes sick or if hes just getting use to the tank. should i worrie? mabey hes just not hungry
what sould i try? his placment is on the bottom of the tank and a maxi jet 900 is semi pointed on him. like yesterday. any ideas?
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Old 04-08-2007, 04:41 PM   #8
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Quote:
Originally Posted by Frogspawn
and today its been about 6hrs and still he has not opened up.
Leathers every once in a while will do what we call sloughing in which they dont open up and plain look bad. But usually the next day though they are back looking better than ever.
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Old 04-08-2007, 07:52 PM   #9
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cool he just came out.. i am happy now. my stomach sinks every time i think ones of them are sick. then i panic. thanks again for the great advise
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Old 04-08-2007, 11:14 PM   #10
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You can look forward to that happening every few weeks. It happens with mine like that.
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