Dsb question

Discussion in 'Beginner Discussions' started by Nemo84, 27 Jul 2013.

  1. Nemo84

    Nemo84

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    I have bought a 2nd hand 3ft for my sump and planning to go the Dsb route. My display tank dimensions are 1m x 500 x 540h .
    So my sump is 900 x 320 x 320 I'm planning on having my skimmer outside the sump so my first chamber will be 150mm my return chamber will be the same 150mm that leaving me with a middle chamber of 600mm for the dsb.

    So if I make the height of the sand 180mm will the dsb be good enough for my filtration?

    Question number 2 : what is the maximum height of the water that flows over the sand or does this depend on the flow ?


    Question 3 : do I need baffles in a small sump ?
     
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  3. RiaanP

    RiaanP Moderator

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    You can lower the sand to 150mm deep, but 180mm is OK

    Water above sand can be anything from 50mm to 250mm. I run mine deep so I can utilize that extra space as a refugium.

    No need for baffles, they waste space, my opinion.

    On that wide sump, you need a return pump that DELIVERS at least 2200L/h back into your display. After head height and back pressure are taken into account. So a 3000L/h pump should do it, depending on pump make and setup.
     
  4. Nemo84

    Nemo84 Thread Starter

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    I'm getting a 4500lph return pump so I will regulate the flow with a vavle
     
  5. Nemo84

    Nemo84 Thread Starter

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    Would this gravel work in a dsb or is it too coarse ?

    dsb1.jpg
     
  6. RiaanP

    RiaanP Moderator

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    too coarse, unless you make it 220mm deep, or more.

    The coarser the substrate the deeper it must be.

    Normal playsand from Reggies or a garden centre is just fine enough. Just wash it properly
     
  7. Nemo84

    Nemo84 Thread Starter

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    Do I need a light over the Dsb?
     
  8. RiaanP

    RiaanP Moderator

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    No.

    Unless you want to use the water above the sand as a refugium.
     
  9. The Viskop

    The Viskop Viskop OOOOON!

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    Hey @RiaanP I am having a bit worried bout my DSB at the moment and know you the Guru her on the site with regards to it, im getting a layer of silt building up on the top of it the flow is quite high but im thinking my water may be a bit deep over the sand bed.

    I used reggies play sand and washed it like a million times i see some life scurrying about at night but just a bit worried

    20130701_080054.jpg

    20130821_073705.jpg
     
    Last edited by a moderator: 26 Nov 2015
  10. dallasg

    dallasg Moderator MASA Contributor

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    that dsb is ok, can you not add a filter sock? you can even add a hermit or 2 to keep the top clean
     
  11. The Viskop

    The Viskop Viskop OOOOON!

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    Shall i just hook the filter sock onto the overflow pipe? Ill get some hermits this weekend for the DSB thanks @dallasg, i been thinking of using Orca cubes as well but maybe i should be a bit patient with the DSB and see what happens.
     
    Last edited by a moderator: 26 Nov 2015
  12. dallasg

    dallasg Moderator MASA Contributor

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    i use the pool gobbler socks from builders, R45 for 5, change every 3-4 days
    the cubes will work quicker, DSB's do work but not quick enough for me on new systems
     
  13. The Viskop

    The Viskop Viskop OOOOON!

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    could i run them together, throw some orca cubes in the filter sock by the inlet and leave the DSB?
     
  14. Gary Roebuck

    Gary Roebuck

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    i ran them together with great affect but i don't advise the filter sock idea..
    ..tried that.. failed!
    as they say in the classics ..RTFM... use the bomb method..
    cubes in a bag n run an air stone.. done.
     
  15. The Viskop

    The Viskop Viskop OOOOON!

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    Sweet i think my minds made up then i just need something to try reduce the waste produce and think the DSB is going to take a bit longer to get into action. i dont want an algae bloom on my hands...

    Ill run the orca with the DSB then slowly reduce over a couple months to try let the DSB take on more waste
     
  16. Gary Roebuck

    Gary Roebuck

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    why not..? u think u're special? school fees!! ;)
     
  17. The Viskop

    The Viskop Viskop OOOOON!

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    Hahaha i had school fees with my last tank when i dropped it and almost chopped my foot off. it sprung a leak so i emptied it and resealed while resealing my sea hare (Due to my algae bloom i was having) got caught in the one pump and poisoned my water all live stock gone. but at least a fixed tank... then when i lifted the tank to the stand it happened that slippery glass feeling...:blush:
     
  18. Gary Roebuck

    Gary Roebuck

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    aaahh... high school fees then..? if u had lost the foot that could be considered university entrance fee..
     
  19. RiaanP

    RiaanP Moderator

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    What return pump do you have?
    How many elbows on the return line?
    How wide is your sump?

    For every 150mm wide sump, you need to deliver 1000L/h into the display. Note the word used is "deliver". Not the rating of your pump. Your sump looks like 300mm wide. So you need 2000L/h into the display. Else another 1000L/h pump that pumps water directly from return to your skimmer chamber. For a test before you go out and buy a bigger return pump, use a small Hailea pump for a month that pumps directly to first chamber.

    The flow rate is too low, that is why you get the excess settlement. A few small hermits, for a week or 2, will help to reduce the current settlement. A few empty shells or a small piece of liverock on the sand to provide housing for the worms and copepods will help as well.

    My water depth on main DSB is 150mm above the sand. The remote DSB is 250mm water depth above the sand.
     
  20. The Viskop

    The Viskop Viskop OOOOON!

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    The return pump is a waterfall 4000 lph obviously with the head height etc it will be reduced i got a spare pump i can use to see if the flow is the problem.

    I put a small piece of live rock in a couple days ago for housing so ill pop in two hermits and see how it goes.
     
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