Urgent help needed Help: All zoanthids dying back

Discussion in 'Urgent Help Needed' started by DUPPIE, 6 Apr 2013.

  1. DUPPIE

    DUPPIE

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    Hi All !

    Need some assistance please. My Zoa's have all been dying back over the last month, even the piece i added a week ago. I have done major water changes but nothing seems so help. All the other corals and livestock seem to be fine. I've checked for anything that could be eating or irritating them (a few times at night as well), but can't see anything. The tank volume is about 650 litres with 3x 150w metal halides, sump tank with DSB, 2X Aquamedic skimmers, and about 45kg live rock. Flow in main tank is done by 2x 3000l/hr and 2x 5000l/hr powerheads. The tank has only been running for about 4 months. Any help will be highly appreciated.

    The rock with only a few heads left (pic 1) was totally covered when i bought it. The other pics shows how the die back starts, they stop opening and then shrivel up and die.

    Thanks !!

    bbpics april13 018.jpg

    bbpics april13 019.jpg

    bbpics april13 020.jpg
     
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  3. Daneo

    Daneo

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    any water testing done ??If so what we looking at ?
     
  4. butcherman

    butcherman Moderator MASA Contributor

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    something eating them perhaps? nudibranchs?
     
  5. HenkHugo

    HenkHugo

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    Check your alkalinity
     
  6. gMAN

    gMAN with the plan

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    Check the tank a few hours after lights out or late at night for any parasites or nudibranch's...
     
  7. pixel

    pixel

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    Like greg said. Vietnam zoas = nudibranches. Good luck with that
     
  8. Gerhard DP

    Gerhard DP

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    I get the same thing with Lumo green zoas. Would like to see if there is anything one can do.
     
  9. DUPPIE

    DUPPIE Thread Starter

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    Thanks for the replies. I have looked (with a small torch) at different times during the night, but haven't seen anything eating the zoa's. All water perimeters are fine, have also been doing quite a few water changes. All the other corals seem fine (softies and a few LPS). The interresting thing is that the Zoa's that are left on the rock in the first picture all open up nicely and look healthy (the one's that didn't die).
     
    Last edited: 6 Apr 2013
  10. LCornelius

    LCornelius Moderator

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    Have you dosed any chemicals or killed aptisia?
     
  11. Wesd

    Wesd

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    it might also be due to where they are placed in the tank, how high up are they in the water column???
     
  12. RiaanP

    RiaanP Moderator

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    Rather get yourself coral dip, and dip them according to the instructions.

    There can be spiders, sundail snails or nudibranches eating them.
     
  13. Fred d

    Fred d

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    Have you changed anything like flow strength , direction of flow , location of colonies , other rockwork in the display , added some rock to the system maybe a new colony of zoas just before the die off started ? When did the trouble start .
     
  14. Express Reef

    Express Reef

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    Get a very good carbon and run some carbon... and like Riaan said, get coral dip and dip all the corals to make 100% sure there is nothing eating them...
     
    Last edited: 6 Apr 2013
  15. DUPPIE

    DUPPIE Thread Starter

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    Thanks guys !

    I never dose anything, just regular weekly water changes. Most of the Zoa's are placed fairly low in the tank, as i think the 450 watt metal halides give off more than enough light (2x 10000k/1x 20000k). All test results are fine. I do have a few aptasia, but haven't tried to kill them with any chemicals yet. I did check for critters again last night (11pm) and early this morning (3am), still can't see anything. What coral dip should i use ? The closest shop to me sells Brightwell products, don't now if they make any coral dip products. Do you guys think that it will help to frag the dying pieces off ? (it seems that the die off starts at a certain point and then spreads across the rock). I don't feed my fish a lot, i know Zoa's don't need to be fed, but do you guys think that the nutrient levels in the tank might be to low causing the problem (tank only been running for 4 months) ? Oh yes, my S.G. is at 1.026, might this be the problem ? Is it advisable to look into getting a Copperband butterfly or maybe some Peppermint shrimp, or something else to see if they might help ?

    Thanks again for all the help !!
     
    Last edited: 7 Apr 2013
  16. Wesd

    Wesd

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    iIould say frag where the die off starts and then move them higher in the tank (if possible) and see if that makes any difference and definately give them a dip. Just my 2 cents :)
     
  17. ShaunSwindon

    ShaunSwindon

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    Not all nudibranchs are bad. Berghia Nudibrach eat only Aiptasia if I remember correctly :thumbup:
     
  18. ShaunSwindon

    ShaunSwindon

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    My suggestion would be dip (Brightwell Aquatics "MediCoral Coral Dip") :thumbup:

    I am only recommending this brand as I have used it personally.

    Is there any cyno or detris on the rock? Is there any algae growth on the rock where the ZOA's used to be?

    Is there enough flow over this area?

    Is there too much flow over this area?

    Are you feeding your corals?

    It could be a few things unfortunately :blush:
     
  19. DUPPIE

    DUPPIE Thread Starter

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    Checked again with all lights on, and found these. Don't know if these are the culprits as they are extremely tiny. (Tiny white spots/dots on the sides of the polyps). They seem to be on the healthy polyps as well. Can anyone i.d. these ? Sorry for pic quality, best i could manage !

    bb zoas 002.jpg

    bb zoas 003.jpg

    bb zoas 004.jpg

    bb zoas 005.jpg
     
  20. brentnorm

    brentnorm

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    As Shaun says, give them a dip. Can't do any harm.
     
  21. DUPPIE

    DUPPIE Thread Starter

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    Thanks Shaun !

    I don't feed any of my corals, could this be the problem ? (zoathids not getting enough food from just their symbiotic algae). I think flow is just about right, some rocks are in higher flow areas but are also dying.
     
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