Too much or too little flow?

Discussion in 'Pumps and Waterflow' started by herkie, 19 Feb 2008.

  1. herkie

    herkie R.I.P.

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    I know this tank that is +-3mx800x800 and I am concerned about the flow in this system. In overall the flow in the tank is huge, but it has problems associated with too little flow(Cyano), and it is a MISSION to find a suitable place for the coral in it. If you change the flow in one area then something else it that area goois a tantrum while the original sulker is jubilating.
    The total flow in this tank started off at30000l and now sits at not less than 50000l. The flow increase did nothing to the Cyano and also kept a small % of the coral happy, the rest sulks every 2nd day.
    Is there specific designs that works better in big tanks?
    All the tests is ok or borders very close to what it should be.
    Quite a variety of coral in the tank.
     
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  3. Kanga

    Kanga Retired Moderator MASA Contributor

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    Could you possibly do a diagram of how the flow works in the tank.

    Is is from 1 or 2 central points, By the sound of things you have huge flow in some areas and to little in others.

    And finally, where are the pics:D
     
  4. DragonReef

    DragonReef

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    Herkie, what are the parameters and what is your phosphate reading.

    Tank size is approximately 1000l give or take, so that makes 50 X tank turnover. This is sufficient flow. Placement of powerheads / water moving devices needs to be played around with.
    Also random alternating flow is preffered as opposed to constant one directional flow. Wave maker device or simple light timer would help by switching some pumps off to allow currents to constantly change and swirl, helping to prevent the build up of detritus.

    Flow needs to be directed towards the overflow as much as possbile. Your skimmer plays an important role in nutrient removal, but is only as effective as the raw water that feeds it.
     
  5. herkie

    herkie Thread Starter R.I.P.

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    More flow

    One day when I'm grown up. Will try tomorrouw-nothing guaranteed.
     
  6. herkie

    herkie Thread Starter R.I.P.

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    DragonReef, you make sense. I think the timer thing can possibly change things at a reasonable price. I get the idea this tank needs a BIG PUMP.
     
  7. Alfie

    Alfie

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    As a cheap option I use one of these boyu timers. I fits 2 power heads to a unit and when the one switches off the other switches on. Only R100.
     
  8. Alfie

    Alfie

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  9. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Herkie,if im correct,you are also dosing vodka in your system,correct?if so,i did read somewhere that vodka helps seed cyano.if you are dosing vodka,cut your dosage to half the amount you currently dosing.oh yes and whats your po4 readings
     
  10. Mekaeel

    Mekaeel Moderator MASA Contributor

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    where did you get it from Alfie?
     
  11. Alfie

    Alfie

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    Mekaeel I picked that one up at Sams.
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    damn,i was in CT and stopped at Sams.didnt see it though.well maybe when i order something from him,will take 2 of those timers.
     
  13. Mekaeel

    Mekaeel Moderator MASA Contributor

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    by the way you got a pic of the timer?
     
  14. herkie

    herkie Thread Starter R.I.P.

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    Cyano

    Mekaeel, I did the vodka thing for a short while and stopped. I would l;ove to have a tank this size but unfortunately its not mine. You might see it if you come for a visit.
     
  15. Mekaeel

    Mekaeel Moderator MASA Contributor

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    yeah im over due for a visit.gotta come your way.any particular reason why you stopped with the vodka dosing?negative effects?
     
  16. Alfie

    Alfie

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    No but I will take one over the weekend. Check out the electronic timer that is posted in the other thread as well. You have got much better control and it also has battery back up for our power outages.
     
  17. Mekaeel

    Mekaeel Moderator MASA Contributor

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    yeah i did check it out,its lekker
     
  18. herkie

    herkie Thread Starter R.I.P.

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    Mekaeel, I saw some cyano pop up and read some other ous also had that and then decided im fiddling with something I dont really need.
     
  19. jacquesb

    jacquesb Retired Moderator

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    Hi Herkie -

    Here's my opinion - I think personally two very strong pumps, one at each end of the tank, with the outlets pointing towards each other, and then some smaller pumps at very low levels, (inbetween the live rock) that moves water from back to front...

    That should give you quite a decent turbulent flow, especially if you can even put these pumps on timers or wavemakers... a 3 Metre tank is HUGE - and the amount of water in there will have to be moved...

    Perhaps 4 ReSun 15000 Wavemakers (one in each corner) should DEFINITELY do the trick - as they are on wavemaker timers, and when they blow at their highest setting the move 15000 litres of water per minute! THAT's quite strong!
     
  20. seank

    seank

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    Agree on the wavemakers, but pumps in bottom of tank between live rock is not always good, as it will be difficult to reach as well as maintenance if something goes wrong- you'll have to unpack the rock again. Just a thought
     
  21. lIghty

    lIghty

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    if possible, run pvc pipe with holes
    under the LR that is fed by a powerhead in a place easy to do maintenance.
     
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