New tank fish dying

Discussion in 'General Discussions and Advice' started by GregK, 18 May 2015.

  1. GregK

    GregK

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    Hi everyone
    New to marine tanks. My fish are dying one after the other within a week.So far fish added were 2 clown fish 20-25mm one damsel also 20-25mm and a bicolour blenny 25mm.My tank is 520l with 125l refugium with water par=Ph 8.2 Nitrite 0.2-0.1 Nitrate 2-5 & ammonia =0. Tank cycled about a month ago. Done water change +-30% 2-3 weeks ago. Polyps, leather finger coral and zoanthids all doing very well.
    Also got CUC: a star fish doing well and 2 cleaner shrimp(very happy) 2 hermit crabs doing great job cleaning up. CUC was added after tank cycled more than a month ago.

    Any ideas/suggestions would be appreciated.Thx
     
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  3. Vishaal

    Vishaal

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    HI Gregk,

    Did you add the fish all together and how long ago were they added ?
     
  4. GregK

    GregK Thread Starter

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    Added fish same time, was told because all were small not much additional load on the system.
    All fish were young fish about 20-25 mm. Tested water before adding ....all good
    tested everyday after adding fish and still no spike......water par still constant.
    Also did about 1.5 hrs acclimatization, first 30 min floating in tank, then water dripping slowly into bag of fish from LFS, while slowly replacing water from my tank into LFS bags.
     
  5. GregK

    GregK Thread Starter

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    fish added last Sunday and last of the fish died this Sunday
     
  6. Mouse

    Mouse

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    What test kits are you using?

    Perhaps the kits you are using are not reading accurately - can you get someone else to test your water for you?

    How long did you cycle the tank for?
     
  7. Keegan1

    Keegan1

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    Maybe the fish you bought were sick...
     
  8. madmatt

    madmatt

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    Are there any marking on the dead fish
     
  9. GregK

    GregK Thread Starter

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    Tank started cycling about 15 March. Using a Red Sea test kit that comes with separate Alkalinity, PH, Nitrite, Nitrate and Ammonia tests. Pic attached
    Question: if I take a water sample to someone else how long would it be ok before the test needs to be done.

    test kit.jpg
     
  10. Mouse

    Mouse

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    Any hidden hitchikers? Perhaps a mantis? :eek:

    When the lights are out, get the torch out and peek around and see whether you can see anything hidden in the rocks - could well be a nasty lurking in there.
    Shrimps can be sensitive to water conditions so if they are doing well, it may be something else.
     
  11. madmatt

    madmatt

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    That's why I ask any marks on the dead fish.
    Use a red light if you can.Won't scare anything away as easy
     
  12. GregK

    GregK Thread Starter

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    shrimp get to the fish during the day or at night before I see the dead fish.
    Clowns looked suspect from the start, were staying in corners and looked like the were tiered all the time
    Damsel just ducked into into first whole he found and never came out. My blenny was a surprise cause he was moving around well that night till I found him dead in a corner. Would a hermit crab catch the fish when sleeping at night, shell is about 2.5-3 cm. If anything else nasty then small, checked all items before adding.
     
  13. Mouse

    Mouse

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    These hikers hide in the bolt holes of rocks, deep down where you may not see them initially.

    Definitely try the red light at night as per @madmatt's suggestion or if not a red one, a torch with a red cloth / material over it.
     
    Last edited by a moderator: 26 Nov 2015
  14. GregK

    GregK Thread Starter

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    got a red light on my torch, will try it tonight. Used it when I was checking if the fish were sleeping or whatever at night but was not looking for nasty's, any comments on the hermit crabs catching them
     
  15. madmatt

    madmatt

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    Are there any marks on the dead fish??
     
  16. Mouse

    Mouse

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    I take it they're gone by the time he gets to them
     
  17. GregK

    GregK Thread Starter

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    the only fish I got to soon enough was a clown and it seemed to be fine, nothing that looked like it could of been attacked. Anything else I can check for perhaps activated carbon etc(using Boyu) been in for about 2 months.
    Done some frags on green star polyps and Zoanthids, I heard they release toxins......sorry just grasping at straws here now but really wanting to start adding fish ....but that would stay alive
     
  18. Jason

    Jason

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    Depending on the hermit crabs you have. The big red hairy hermit crabs are bastards, they have black spots on there body
     
  19. RiaanP

    RiaanP Moderator

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    On the size of your hermits, they would not bother fish sleeping.

    As they died a week later, it could be whitespot. Any fine salt like spots o the fish? More noticeable on the fins.
     
  20. KeeganP

    KeeganP

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    Hi GregK,

    I just had a look at your setup. From your "New marine tank" http://www.marineaquariumsa.com/beginner-discussions/60017-new-marine-tank-help-needed.html thread.

    Your Nitrites/Nitrates were 0...

    Tell me the rock that you have in those pic's is that all the LR in there?

    My concerns are that, the cycle process was not complete which is why you are having this problem.

    The tank could sit like that for 10 months, but without the necessary Bactria etc growing in your tank no fish will survive.

    Judging from the pic's, the first thing I will go out and do is get some decent LR.

    The rock in your pic's look like normal base rock...

    Can you post an updated full tank shot?

    Edit: After reading through the thread @459b suggestion needs to be followed,

    I would also definitely add more LR. this is where beneficial bacteria will come from and live.
     
    Last edited by a moderator: 26 Nov 2015
  21. GregK

    GregK Thread Starter

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    did not see anything on the fish while alive or on the dead clown. fins looked good making me think no physical attack. Hermit crabs are the only things in the tank suspected(or nasty's) shrimp too small

    hermit crab.jpg
     
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