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  1. #1

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    Default How low is the intake on your HOB?


    0 Not allowed!
    I'm wondering how low everyone's intake is on their HOB's. I've always thought for the best circulation the intake should reach just above the substrate, which is what I've done. I do have problems removing my pre-filter sponge because there is no room to pull it downward. So have I simply gone too low? I've noticed pics of many experienced aquarists tanks and I see intakes quite a few inches above the substrate. What are your thoughts? Should I lighten "UP"??

  2. #2

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    Default


    0 Not allowed!
    Well, I can tell you that with the AC70 on the 40B, I could only use one of the intake tubes on the intake, two would have buried the intake partially in the sand substrate...but my substrate is deep, probably too deep

    Even if it weren't, I'd still prefer to have it like it is...the very bottom of my intake tube is maybe 3" above the sand, with a PFS attached....it's mostly hidden behind my DW stump
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  3. #3

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    Default


    0 Not allowed!
    So maybe having the intake all the way to the bottom isn't all that important?? I'm thinking I'm making things difficult for myself....

  4. #4

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    Default


    0 Not allowed!
    My intakes on cannisters and HOB are about 2 inches off the substrate. It's just where they are, no particular reason.
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  5. #5

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    Default


    0 Not allowed!
    I put the intake as low as I can get it with the supplied tubing. Sometimes that puts it very near the bottom, sometimes not so much. I don't think it makes a huge amount of difference.

    -S

  6. #6

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    Default


    3 Not allowed!
    The argument for putting them closer to the substrate, is because the most toxic water will be lowest in the water column. That makes sense, because that's where fish poop, decaying plant matter and food end up.

    I have all of my intakes as close to the substrate as I can get them, with exception to one in the 75gal. I have that a little higher - about mid-tank. The only reason is because I don't have an extension tube for it, but I'm not very worried about it. As long as it's pretty low in the water column, you should be fine.
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  7. #7

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    Default


    0 Not allowed!
    It seems to me that the lowest you could place it, the better...just because the waterfall may get instantly re-taken up by the filter instead of circulating through the tank...but that's just a guess

    As others have said, I don't really think it makes much difference, except for aesthetics, depending on what you have in the tank to hide (or camaflouge) it or not

    The tubes on most HOB's could be cut to customize, I would guess

    EDIT: Once again, ninja'd by Kev, who has a much better explanation
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  8. #8

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    Default


    1 Not allowed!
    Maybe I need to "customize" the length of my intake...as it sits right now my intake is right at the substrate...kind of a pain!!

  9. #9

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    Default


    0 Not allowed!
    I use two aqueon 55's on my 36, one closer to the substrate one about mid way, just incase it makes a difference (not that I've noticed one while they were in other positions)

  10. #10

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    Default


    2 Not allowed!
    Quote Originally Posted by DeboraBremner View Post
    Maybe I need to "customize" the length of my intake...as it sits right now my intake is right at the substrate...kind of a pain!!
    It's easy, just mark where you want the top wide flange of the bottom tube to fit onto the top tube, and cut the bottom of the top tube off enough to accomodate
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