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Water circulation

Discussion in 'Are you new to aquatic plants? Start here' started by mathman, Feb 5, 2012.

  1. mathman

    mathman Guru Class Expert

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    Is there such thing as too much circulation? Does high circulation cause algae?

    Thanks
     
  2. Biollante

    Biollante Lifetime Charter Member
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    Things Taken to Nth tend to be Silly

    Hi,

    Usually more circulation is better,


    • I am sure there is a point of diminishing return and
    • as with anything it can be pushed to the point of ridiculous.

    Generally, high circulation is not a cause of algae.:)


    I have more I can add but I offend folks when I do that.:(


    Biollante
     
  3. Tom Barr

    Tom Barr Founder
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    Flows over 2 knots are bad, but many seem optimal around 1 knot.

    That is a fast flow in an aquarium!
     
  4. Biollante

    Biollante Lifetime Charter Member
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    Lazy Stream, Think Again

    Hi,

    Of course, 1-knot (nautical mile per hour) is the equivalent of changing the water in a 55-gallon tank every 3.48 seconds, 17.24 times a minute, 1034.5 times an hour, figure 51,725-gallons per hour.

    Still there are a couple of other considerations...:apathy:


    Biollante

     
  5. dutchy

    dutchy Plant Guru Team
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  6. Doc7

    Doc7 Member

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    My issue with flow isn't having enough pumping capacity, it's directing it around properly. I have 2 x Eheim 2217s in a 40 breeder and even still, it's a big tradeoff when I aim the spraybars (4 individually aim-able sections):

    - masses of stem plants having "Dead spots" in the middle and decent if not somewhat high movement of leaves on the outer fringes,

    vs

    - getting movement throughout the mass of plants but several inches of "blowing sideways" plants which isn't very attractive.

    I currently have one set of spray bars aiming at the front glass of the tank, so it comes down and back and hits the mass of stem plants on the front side, and another spraybar pointing down the back glass so it flows in the opposite direction through the stem plants. Still dead in the middle (thanks, 18" wide 40 breeder!)

    I've only recently made this adjustment (once my rotala grew in thick enough that it no longer was "all waving" like when i first planted), and will give it two weeks to see if the dead spots are as dead as i think they are and cause algae.
     
  7. mathman

    mathman Guru Class Expert

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    I also use two eheim filters in a densely planted tank.

    One of the many concerns, I think we all share, is how can we hide the equipment so that we have a pleasing view of the tank without all the eye soaring equipment. In my case, I do not use a spray bar...so, what would be the best placement for the inputs and output of both filters. Keep in mind that this is a densely planted tank with java ferns and amazon swords. If possible please provide A picture or drawing as I am a visual learner. :)
     
  8. scottward

    scottward Guru Class Expert

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    Theres no perfect answer here, of course.

    For me though, I gave up moving the flow about...now I just move the plants instead, putting the more demanding ones where they cop the best part of the flow, and the less demanding somewhere else.

    When I take cuttings from a stem, I make sure I plant the cuttings somewhere where the CO2 is at least as good as where the cuttings came from (i.e. plant cuttings "up stream").

    Scott.
     
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