Internal flow

Discussion in 'Pumps and Waterflow' started by DeanT, 11 Oct 2012.

  1. DeanT

    DeanT Dean

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    Hi all
    Thought I would throw this out there and see if I can conclude my next move

    I have a tank 2.5 x 1 x .75 with 4 flow
    Pumps working at around 80 % which means each pump is pushing around 10 000 LPh according to web

    I wanted to know if I should add another 2 pumps to the system , or not

    I am not sure what the recommended flow rate is for a reef system and also want to try and eliminate dead spots amongst the reef due to algae and detritus build up

    Any comments / advice
    Thanks
     
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  3. RiaanP

    RiaanP Moderator

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    Your display is about 1750L

    We use a turnover rate of between 20 and 60, depending on rock placements and type of corals. SPS you go for higher, maybe even exceeding 60.

    Using a turnover rate of 20, you should aim at having about 35000L/h flow delivered by all flow pumps together. You got 40000L/h. So it seems OK, but it does depend on rock placement.
     
  4. jacquesb

    jacquesb Retired Moderator

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    Good morning Dean. Great answer that Riaan gave. I would just add to this, that you should determine yourself, IF you have detritus settlement areas. In which case, you can add a power-head/flow pump, or try and put in a hidden "cheap" pump that you can just switch on when you see the detritus build-up happen.

    In a "fish only" tank - the amount of water flow is less as important, as for a reef tank. For LPS you don't want a lot of HUGE water flow, and soft-corals don't mind as much (actually - they prefer slow to medium water flow).

    And as Riaan said - high to VERY HIGH water flow for SPS corals.
     
  5. DeanT

    DeanT Thread Starter Dean

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    [​IMG]

    Here is a pic of the tank which is quite old and taken using my phone so apologies for the quality

    So if I add another 2 pumps then this will probably put the ratio in better perspective ?
     
  6. jacquesb

    jacquesb Retired Moderator

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    For soft-corals and SPS, yes Dean.

    But, I would then place them much lower down in your tank.....
     
  7. DeanT

    DeanT Thread Starter Dean

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    My plan was to have 3 on each side and if you look at the side of the tank the pumps would be positioned in a triangle
    2 pumps
    Pushing past the back and front of the reef and the middle One higher and pushing over the top of the reef
     
  8. jacquesb

    jacquesb Retired Moderator

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    I would change this around Dean - have two pumps over the top of the reef (where most of your SPS will most likely be), and one pump at the bottom of the reef.
     
  9. DeanT

    DeanT Thread Starter Dean

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    Would I not need some type of Flow running across the back I the tank ?
     
  10. RiaanP

    RiaanP Moderator

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    What about smaller Seio pumps, mounted against the back glass, behind the rock work, angled at 45 to 60 degrees, blowing into the rock work. About 4 of them. Your tank is 1m front to back.

    Or place in the middle 2 Ocean runner 15000 pumps, also behind the rock work, pointing to the left and right. Advantage is that they do have a night mode and your fish can go and sleep.
     
  11. DeanT

    DeanT Thread Starter Dean

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    Access tithe back of tank is maybe impossible
    It is up against a fixed wall with no possibility of moving it

    just didn't want to go over kill on the pumps so wanted advice first
    Though of putting the middle 2 pumps on pulse mode to mix it up a
    Little

    I have access to the side of the tank and maybe the corner of the back but nothing else
     
  12. irie ivan

    irie ivan MASA Contributor

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    Short of waves breaking over sides of tank, you cannot overdo flow! Just avoid sheer force directly at a coral...
     
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