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  1. #1

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    Default amending a Fluval U4 so it is safe for shrimp


    0 Not allowed!
    I have a Fluval U4 submersible and am getting some Red Cherry Shrimp. My concern is that the filter may suck in the shrimp.

    My first question should perhaps be: Am I worried over nothing?

    If anyone else shares my concern, then: What sort of pre-filter sponge thing could I affix over the intakes? Would I just tie the sponge to the outside (both sides of the) filter with fishing line? The intakes on this model are all along 2 sides, with the output in the front.

    Also, the media has carbon in the side-out cartridges. I know not to use any medications containing copper in the RCS's environment, but am now wondering if the carbon will harm the RCS.
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  2. #2

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    Default


    2 Not allowed!
    The carbon will not hurt them though it really is unnecessary. If you could get replace it with another filter to increase bio mass, you'd be sitting pretty. As for the intake it doesn't look like it would be a problem, though I have no experience with this type of filter. You can get a thin strip of filter floss to wrap over the intakes and hold in place with some fishing line. I think I've seen rubber bands used and they would be easier to work with, but I would imagine they would degrade over time.
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  3. #3

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    Default


    5 Not allowed!
    I had a u1 on one of my old shrimp tanks so I imagine the u4 is just a bigger version.

    Quote Originally Posted by RiversGirl View Post

    My first question should perhaps be: Am I worried over nothing?
    This type of filter can and probably will suck in shrimp. Adults will be fine but any babies are potentially at risk, I lost a few babies that way before I took action

    If anyone else shares my concern, then: What sort of pre-filter sponge thing could I affix over the intakes? Would I just tie the sponge to the outside (both sides of the) filter with fishing line? The intakes on this model are all along 2 sides, with the output in the front.

    I used a thin knit, but very strong tights which I pulled over the whole of the filter and cut holes for the outlet. If you do this make sure its not too thick or it will block up and disrupt the filter's flow

    Also, the media has carbon in the side-out cartridges. I know not to use any medications containing copper in the RCS's environment, but am now wondering if the carbon will harm the RCS.

    The carbon won't harm the shrimp but you would be better off removing the carbon and adding extra ceramic media or filter sponge
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  4. #4

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    Default


    0 Not allowed!
    Thank you both for your suggestions! I'll see about getting some black pantyhose, perhaps. I used to wear such things (fyi to the guys: they are not comfy beasts!) perhaps I still have a pair buried in a drawer somewhere...

    So replacing the carbon cartridge set-up sounds less pressing, and could be a longer-term project. Maybe I could even stretch it out until the recommended replacement date, then just replace it with non-carbon.

    The cartridges are a slide-out, plastic-encased little sheet. Half is a sponge and the other layer is the carbon. I've searched before for a non-carbon cartridge for this filter, but do not seem to be turning up one without the carbon part.

    Can I just stuff some sort of sponge or something in those two areas, instead? I'd replace only one at a time, if I needed to for the BB colony. Or maybe I should try to pry open one of those cages and toss out the carbon part?

    The third cartridge in this filter is filled with those plastic-looking cylinders "Biomax Nodes".
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  5. #5

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    Default


    1 Not allowed!
    The carbon will harbor BB, but not very much.

    I would stuff it with more bio media rings, gives you more area to grow BB. Most of us here don't use carbon at all, except to remove meds from the water after a treatment for disease, etc. I keep my carbon stored for future use, just in case, in my fish supply closet.

    I like these, but they are quite large...there are many different types of ceramic bio-media: http://www.amazon.com/Fluval-Biomax-.../dp/B000HHSG5M
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  6. #6

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    Default


    2 Not allowed!
    Try AquaClear 30 or 50 size biomedia. They are much smaller ceramic pieces and would probably fit in your filter. You can put them in a new, clean nylon (check for colorfastness). Add as many as you can and remove the carbon in about 4-5 weeks. Then use just the ceramic biomedia and the sponge.
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  7. #7

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    Default


    2 Not allowed!
    I have a U4. I have Amano Shrimp in my tank. None of them have suffered any run ins with the filter. Your results may vary. If they are indeed originating in river streams, then I'd think that the flow from your average home filter is not going to be of harm.

    There are other thicker sponge pieces separate from the carbon pads. If you don't want to run the carbon I'd just take those out and run it without.


    For the people suggesting replacing it with other media.... there is no room where the carbon is to put bio media. Its literally a flat sheet of carbon filter (like the mesh texture of a scrub pad) on one side and floss layer on the other. They look like this:


  8. #8

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    Default


    0 Not allowed!
    Quote Originally Posted by Trillianne View Post
    I have a U4. I have Amano Shrimp in my tank. None of them have suffered any run ins with the filter. Your results may vary. If they are indeed originating in river streams, then I'd think that the flow from your average home filter is not going to be of harm.

    There are other thicker sponge pieces separate from the carbon pads. If you don't want to run the carbon I'd just take those out and run it without.


    For the people suggesting replacing it with other media.... there is no room where the carbon is to put bio media. Its literally a flat sheet of carbon filter (like the mesh texture of a scrub pad) on one side and floss layer on the other. They look like this:


    Thanks for explaining.
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  9. #9

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    Default


    0 Not allowed!
    Trillianne ~ Thank you so much for your advice! Do your Amano Shrimp breed in there? Also, thanks for helping me explain my delema. A picture really is worth a thousand words! I was having a hard time explaining.

    Quote Originally Posted by Trillianne View Post
    There are other thicker sponge pieces separate from the carbon pads. If you don't want to run the carbon I'd just take those out and run it without.
    I have a question for you about the thicker sponge pieces you mention. Do you purchase these under the Fluval name? Do these have a solid border to slide them into the filter? or is this something that you just stuff inside of it?
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  10. #10

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    Default


    1 Not allowed!
    Mine came with my filter, they are behind the little carbon/floss sides.

    Here's the best photo I could find to illustrate the parts:



    The Blue tray that the fingers are pulling out, is internally faced with the carbon/floss pad but behind that is the foam sponges, the blue part is just a cartridge to hold the sponge and carbon pad. My filter came with them, and I've used the same ones, just rinsing them as needed for my maintenance.

    As for Amano's and breeding.. yes they have mated, no they have not produced offspring. Amano shrimp maturation apparently requires salinity in their water, which I do not have.

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