SPS Polyp extension

Discussion in 'General Coral Care' started by Boendoe, 14 Aug 2009.

  1. Boendoe

    Boendoe

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    Hi all I hope some of the SPS guru's can help me, my SPS frags only extend their polyps about 30% during the day when the lights are on:(. But when I have a look in the morning before I go to work the light are still off and they are fully extended. Most of my frags are about 3 to 4 weeks old.

    I tested my water last night and it was as follows:

    PH 8.3
    Cal 430
    Phosphates 0.5
    Nitrates 0
    Nitrites 0
    Temp 27
    Sal 1.025

    I do a 15% water change every weekend using Instant Ocean salt. My lighting is a 2x 150Watt 10000K MH plus 2x 54watt 6400K t5' and one 34 watt T8.


    The T8 goes on at 10:00 am then the t5's at 11:00 and lastly the MH at 12:00, then the lights goes off form 21:00 the MH 21:30 the t5's and 22:00 the t8. I have also started feeing "Coral Frenzy", normally during lights on but in the last week during lights out when the polyps where extended.

    All my SPS frags is placed high up in the the system to give them ample light, so please let me know if you see anything that I'm doing wrong so that I can sort it out. Thanks for the help.
     
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  3. Tony

    Tony

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    Most SPS's will extend their polyps after lights out as a means of protecting themselves from predation so they can feed in peace. Some SPS's are open during the day and night. It depends on the species. The polyp extension is a good indicator that your corals have settled and are happy in their new home
     
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  4. Boendoe

    Boendoe Thread Starter

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    Cool thanks for the info Tony now I feel a bit more at ease.
     
  5. sihaya

    sihaya

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    Nice post... I'd only also add that these corals can change their eating/extension habits in captivity. Some that are "nocturnal" in the wild might start feeding in the day time in captivity (and vice versa). Also, interestingly, I've heard people say that having a fish that eats corals also changes the coral's feeding pattern such that the coral will start to extend only at night. Of course, I haven't heard much about this because not too many people who keep corals keep fish that eat corals... lol
     
  6. Mekaeel

    Mekaeel Moderator MASA Contributor

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    You are 100% correct Sara! I have my Emperor and French Angel that nip at times on my SPS. Therefore, most of the SPS only show polyp extension at night. Im talking mainly about my Millepora's.
     
  7. sihaya

    sihaya

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    certainly makes sense
     
  8. Boendoe

    Boendoe Thread Starter

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    Thanks Sara it amazing how these creatures can adapt to there surrounding
     
  9. martin

    martin Reef Adict

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    Could it not also be because there is too much food sources in the water and then they dont need to extend?
     
  10. shankpa

    shankpa

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    your issue

    hey, Instant Ocean is not formulated for reefs. your mag might be low and your calcium might be too
     
  11. Boendoe

    Boendoe Thread Starter

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    Sorry but I beg to differ, I have been using Instant Ocean - reef crystals for over 2 years now, all my parameters are stable and at the recommended levels. As Sara said it might be to do with adabtibillity, I had a look again this morning and all my SPS had full extension. To give you an idea, last night I tested the PH, Cal and Mag again.

    Cal - 430

    Mag - 1300 mg/L

    PH - 8.3
     
  12. shankpa

    shankpa

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    confusion


    yea bro, instant ocean reef crystals....not the plain IO. Regular IO usually has around 350ppm calcium and like 1100ppm mag
     
  13. shankpa

    shankpa

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    i apologize, i see your calcium is fine but wheres your mag at?
     
  14. shankpa

    shankpa

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    ok i read your mag, thats cool.
     
  15. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Hi shankpa. At was SG was this tested?
     
  16. shankpa

    shankpa

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