Water height above DSB

Discussion in 'Biological/Natural Filtration and Deep Sand Beds' started by Louis Scheepers, 28 Oct 2010.

  1. Louis Scheepers

    Louis Scheepers

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    My DSB will be 65cmx70cm and 15cm deep, now the question: what height should the water level be above the dsb? I will also keep some macro algea over the dsb.
     
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  3. Singularity

    Singularity Hmmm amper!

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    Many people suggest a water height of 10cm above the dsb
     
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  4. Dikdaan

    Dikdaan

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    Whats the reason for the 10cm?
     
  5. leslie hempel

    leslie hempel Moderator MASA Contributor

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    on some of the filters i have been building latley i have made the water level between 1-2cm average maximum 5cm and so far so good, no detritus settlement on the bed..
    but it differs, i think the norm is around 10cm..
     
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  6. Louis Scheepers

    Louis Scheepers Thread Starter

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    Thanks Leslie

    I might be wrong, but I was also thinking that the deeper the water level, the more detritus settlement. A shallow water level, less settlement. You do want some settlement right? So what will the ideal dept be?

    Riaan had some problems with cyano on his dsb, because of too much settlement, and started the other thread about how much water flow over a wide dsb... I was thinking that his problem might be caused due to a water level that could be to high?

    Riaan, what is your imput?
     
  7. Slagter

    Slagter MASA Contributor

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    Mine only has around 3 - 5 cm of water above the DSB and I must admit, no sediment ever collects on it... Seems to be fairly effective and it's teeming with life!
     
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  8. jaybeepee

    jaybeepee

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    Why not use a filter sock to catch the detritus prior to the dSB. that way you can have a nice slow flow so the a water has a longer tim ein contact with the anaerobic bacteria responsible for N03 to N.

     
  9. leslie hempel

    leslie hempel Moderator MASA Contributor

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    im experimenting a little, but so far so good. the flow over the dsb's is not as fast and for smaller systems (4ft) with a wide DSB area (.600mm x .600mm)
     
  10. jaybeepee

    jaybeepee

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    I'm also no expert but Logically I think you also want a decent depth above the dsb to add 'weight'. To me if there isnt enough height above the sand bed then you are unlikely to get water coming into contact with the lower, anaerobic areas of the sand bed to denitrate you water. Please note, I am thinking logically here and have no scientific proof for this - just a thought/something to think about.

    my DSB is a about 75% of a std 5 ft tank so it is also pretty big and I have 10cm height of water above it. All I do is aim the output of my skimmer to direct a higher laminar flow over the top of the sand bed and it works great. If you really want you can add a powerhead.
     
    Last edited: 28 Oct 2010
  11. lloyd18

    lloyd18

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    Do you want Detritus settlement on the DSB, if so how much.
    The whole top of my DSB is covered and has gone a dark brown colour from the settlement.
    Do I need to remove this somehow?
     
  12. Louis Scheepers

    Louis Scheepers Thread Starter

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    This will be my first attempt at a dsb, so I have no idea how much settlement is good, but I do know that settlement is needed to feed all the goggas in the dsb.
     
  13. Louis Scheepers

    Louis Scheepers Thread Starter

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    I like this idea! Don't you get bubbles in the dsb compartment? Do you have the "over-under-over" baffles, or just one "over" each side of the dsb?
     
  14. xtreme

    xtreme

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    WHAT!! you guys telling now:p my water level is 20cm above the DSB, cool to put all the hitch hikers in. got a few detritus but the cope pods and amphipods and bristles is dealing with it
    not mine
    [​IMG] Amphipod (Mine is the same)

    [​IMG]copepods (Mine looks like ants running around)

    [​IMG] Bristle worms ( Mine looks the same)
     
  15. jaybeepee

    jaybeepee

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    I have debubbler between DSB and return chambers and have no issues with the bubbles from the skimmer (IM1000)

    Cheers
    Jason

     
  16. RiaanP

    RiaanP Moderator

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    In my opinion cheato ball needs more than 10cm Else it lies on the sand. Well, mine would.

    Also, what would the critters on your DSB eat if there ar no settlement? Obviously they need food. It should not cover and completely smother the DSB.
    I got 2 hermits running around there. Also 3 Babelonion Whelks that do an excelent job in turning the top 3 to 5 cm, just as mother nature can.

    I got cayno on my DSB. Light sequence is too long maybe. From 15:00 to 10:00 next day. That is 19 hours. I reduced that now with 5 hours.

    I did increase my flow, by putting a 500l/h pump in the return and pumping rirectly back to skimmer. That helps. And I changed the cryptic tank outlet to the skimmer chamber.
     
  17. Sentari

    Sentari

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    Hmm i'm wondering the same thing. Cause i'm building a new sump. I would like cheato and some LR ontop of my DSB. If so whats the maximum height that the water can be above the DSB? Suggestions?
     
  18. RiaanP

    RiaanP Moderator

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    As deep as possible without flooding your skimmer.

    AND

    Leave anough space for water overflow from display when power goes out.

    I like the second glass pane to be 10mm lower that the first. Use Auto top up and keep water level in return chamber about 20 to 30mm below that of the DSB area. That will minimize the bubbles falling over and being sucked in by return pump. Also less salt spray.

    But then you need to ensure that complete area above return, DSB and skimmer can handle extra water for when return is switched off.
     
  19. Sentari

    Sentari

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    Thanks Riaan!

    I'll probably make a glass stand for my skimmer whats your thoughts?

    My Old tank is 45 Height. So i was thinking of making the DSB Chamber 35 with DSB height at 15. Leaving 10cm above that for incase of water return.

    I'll do a sketch up and show you.

    What you think?
     
    Last edited: 29 Oct 2010
  20. RiaanP

    RiaanP Moderator

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    yip, my TS1 skimmer is also drowning. It is standing on 2 pieces of PVC pipe.

    Water level above sand will be 20cm. Nice. I like that.
    Plus it gives lots of extra total water volume.
     
  21. Sentari

    Sentari

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    Sweet thansk been pondering about that for some time.
     
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