Possible predator in my tank

Discussion in 'General Discussions and Advice' started by dizzyg, 4 Mar 2013.

  1. dizzyg

    dizzyg Red Sea Max 250

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    There is "something" in my tank that is killing / eating stock.

    Anything that was small in my tank is now gone, all my cleaner shrimp, 2 emerald crabs, 2 purple fire fish.

    It could be a mantis but I dont hear the dreaded "click" often. I also can't see any telltale signs like the perfectly bored holes.

    Whatever it is is at the back of the tank under the rocks, I did have a mantis previously but I managed to get that one out because I knew where it was.

    I can't add anything new to my tank until I have the culprit apprehended.

    What are my options?

    I only have 2 snails left so I was thinking of taking them out and dosing with copper which should kill anything that would be causing problems, would my corals suffer? I could remove all my corals and clam and do it if it would help.

    I have tried the bottle trap on various occasions but not catching anything because whatever it is is staying at the back of the tank.
     
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  3. belindamotion

    belindamotion Google Master

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    Did you see anything...? Like a Crab, Bobbitt worm etc...anything..? Asking as you mentioned "it's at the back, under the Rocks".. Did you try spotting it at night..? Could be the best time to catch or spot a "Predator"..:blush:
     
  4. RiaanP

    RiaanP Moderator

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    Why don't you coral your liverock?
    It would cause a massive die off, but is better than using copper.

    Especially if you can dip 50% of the rocks and place them in the sump to recover. After a couple of weeks do the remainder of the rocks and corals in the tank. Then place everything back.
     
  5. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    Haven't seen a thing unfortunately.

    I have done the late night spot checks but cant see anything.

    I have been avoiding the issue but since my last emerald crab went I'm now pissed.

    I also noticed my watchman goby has a big sore on his side but he is eating and it looks like its healing nicely.

    whatever it is, its sneaky and hiding so I really don't know what my options are anymore.
     
  6. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    @RiaanP coral my live rock? what is that?

    also I have a Red Sea Max 250, no sump :(
     
    Last edited by a moderator: 26 Nov 2015
  7. MistaOrange

    MistaOrange

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    I don't think copper is a good idea if you going to put everything back at a later stage as it would be harmful to the invertebrates.
     
  8. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    @MistaOrange I have no invertebrates left due to the "whatever" killing all of them!

    I'm not saying copper is the route I want to go, I will do whatever is best recommended. I will even tear down the whole tank if needed but at this point im going backwards which makes me not like the tank anymore.
     
    Last edited by a moderator: 26 Nov 2015
  9. RiaanP

    RiaanP Moderator

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    missed a word.

    Coral DIP

    To get rid of hidden inverts.
     
    Last edited: 4 Mar 2013
  10. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    @RiaanP

    would I be able to dip rocks that have some corals on them?

    what would die off? Would it be like a mini cycle?

    could I do ALL of my rock at one time?
     
    Last edited by a moderator: 26 Nov 2015
  11. MistaOrange

    MistaOrange

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    Coral are invertebrates.;)
     
  12. RiaanP

    RiaanP Moderator

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    I would first dip 50% of the rocks without corals.
    And place them in the sump to cycle. What would die or come out it brittle stars, worms, copepods. Hopefully your culprit would come out so you can see it, or it will die inside. The ones that is stuck inside would be the problem. They would cause a mini cycle.

    Later when everything is stable again, I would do the remainder of the rocks plus the corals on them.

    This is drastic, as you do loose a lot of beneficial critters. But you would also loose them with copper and copper would have long term issues as well.

    Another option is to dip the rocks in RO water for 5 minutes. Just rinse the rocks thereafter to flush out most of the dead critters.

    As the very very last option, I would copper dip the rocks, but not in the tank but in another container.
     
  13. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    oops! Thanks :p
     
  14. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    @RiaanP

    what are my options when I'm sumpless though? RSM 250 doesn't have a traditional sump.

    would I plastic container with salt water and a flow pump work?

    the majority of my rocks are coral free but I have a feeling whatever it is, is in one of the rocks that are under everything so doesn't have corals on it.
     
    Last edited by a moderator: 26 Nov 2015
  15. MistaOrange

    MistaOrange

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    Won't the copper stay in the rocks for a long while?
     
  16. RiaanP

    RiaanP Moderator

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    Yes, separate container would work, actually are better.


    yes, that is why I said
     
  17. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    Looks like thats what I will do this weekend then.

    Ill take all rock that has no corals on it, dip them and then leave them to cycle from scratch before putting them back in.

    Ill remember to add "rock / coral" dipping to a todo list if I ever start a new tank!
     
  18. RocketRooster

    RocketRooster

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    You say you don't hear the 'click' often. So you do hear something like it?

    I get that sound as well but it's my hermits banging their lids on the glass. :)

    I'd take each piece of rock out, and leave it in the sun for a couple of hours. There will be lots of die-off, but it won't go sterile. But no shrimps would survive.
     
  19. dizzyg

    dizzyg Thread Starter Red Sea Max 250

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    I hear clicks from time to time but cant be 100% sure its even coming from the tank, my open plan living area is quite big and unless I sit in front of the tank I wouldn't be able to confirm the click was even coming from there!
     
  20. saaid

    saaid

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    I also had that problem. Searched the whole tank and found one small pistol shrimp which I moved to a nano but still there is still a clicking sound and a lot of corals are found toppled in the morning and some even chewed on (xenia & Palm tree polyps).

    I did however find one more criminal (I think) after watching the tank at night...nice 6cm wide. The other evil being I have been watching for the past couple of nights is a Polchaete,approximately 12cm long and 1cm thick. This worm is hiding in a rock I really dont want to remove but will have to in order to get the worm. Very evil looking thing and strong too! Maybe you have one too?

    A pic of the crab (not sure how safe he is but I dont trust it)...I have since made peace and placed him with a Trigger and Zebra Eel:whistling:

    2013-02-27 13.43.56.jpg

    2013-02-27 13.44.10.jpg
     
  21. saaid

    saaid

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    A pic of what the worm looks like....

    polyworm.jpg
     
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