Too much pump, too little sump

Discussion in 'Lighting, Filtration & Other Equipment' started by Cliff, Apr 5, 2013.

  1. Cliff

    Cliff

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    Hey folks, I'm here looking for help again. I have a 90 gallon 1/2 round tank, which greatly limits the space beneath the aquarium. The biggest sump I can fit is a 29 gallon. I have installed a 2000 gph external Reeflo Dart. I have plumbed the pump to supply both my PM skimmer and two 1" returns to the tank. I cant seem to get rid of the microbubbles. My overflow return is adequate, with dual 2" return lines. The issue seems to be the fact that I'm flowing 30+ gallons per minute through the sump.

    It appears the flow through the sump is too fast to allow the bubbles to float at the traps (2). If anyone has any design ideas, I'm willing to experiment. I'm currently restricting the flow with a valve much more than I like, but it seems to be the only thing that works to keep micro bubbles at bay.

    Is there something I can do in the overflow/return plumbing to discourage microbubbles? How far apart should the low/high bubble traps be for such high flow? Anything else I'm overlooking?

    Thanks
     
    Cliff, Apr 5, 2013
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  2. Cliff

    mariobrothersleeve squirrel

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    Filter sock? Seems to work 4 me.
     
    mariobrothersleeve, Apr 5, 2013
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  3. Cliff

    MitchReef reef noobie, since 1986

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    OMG..... 2000GPH in a 90G display!!!! A bit of overkill, don't ya think????
     
    MitchReef, Apr 5, 2013
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  4. Cliff

    MitchReef reef noobie, since 1986

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    2 to 5 turnovers is normally considered the appropriate return rate....your total flow should be generated by powerheads / propeller pumps, etc in the tank....
     
    MitchReef, Apr 5, 2013
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  5. Cliff

    Cliff

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    Yes, 2000 GPH may have been a bit ambitious - but the tank really has rocking current if I can get past the bubbles! I've tried a sock and 2 sponges.
     
    Cliff, Apr 5, 2013
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  6. Cliff

    MitchReef reef noobie, since 1986

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    You may not ever get the bubbles under control with that much pump....your flow should really be generated inside the tank....but I gotta admit, it is cool having massive flow!!!! My 75G had a 1000GPH return and an additional 5000GPH inside the tank! SPS just absolutely loved it....but I also ALWAYS had tons of microbubbles....
     
    MitchReef, Apr 5, 2013
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  7. Cliff

    Steveg229 Addicted

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    You could try building a bubble tower. I was having some micro bubble issues when I go sockless every once and a while, so I built this bubble trap. Works perfectly as all bubbles rise to the top and water exits the bottom. Might help...?
     

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    Steveg229, Apr 5, 2013
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  8. Cliff

    Cliff

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    Steve

    Thanks for the idea. It appears you have some sort of media in the bubble tower. What is it? I have a similar tower, using a wide mouth 1 gallon jar to receive the return flow. Bubbles are forced up before the water is pulled under a sump panel. It also looks like you neck down the return line with 2 reducers. Why? What does this do?
     
    Cliff, Apr 5, 2013
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  9. Cliff

    MitchReef reef noobie, since 1986

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    I made one of those once and filled it with LR Rubble just to make a bit more of a torturous path for the water, thus stripping even more of the bubbles from it....I had the most luck of all using a PVC T...
     
    MitchReef, Apr 5, 2013
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  10. Cliff

    Steveg229 Addicted

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    +1 Mitch... Yes, I filled the tower with LR rubble. The reducers....well,...those were the parts I had on hand when I was changing the drain line. You generally never want to slow the flow on your drain line and I was concerned initially but it didn't cause any issues.
     
    Steveg229, Apr 5, 2013
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  11. Cliff

    Cliff

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    So the verdict is in. Yes, you can have too much pump for a 29 gallon sump. I reduced from a 2000 gph reeflo snapper to a reeflo blowhole 1400. NO MORE MICROBUBBLES! And a silent pump. Happy, Happy, Happy.
     
    Cliff, Apr 15, 2013
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  12. Cliff

    mariobrothersleeve squirrel

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    Ive got the reeflo blowhole 850 running @ 680gph. I thought i had good flow!
     
    mariobrothersleeve, Apr 15, 2013
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  13. Cliff

    Sidekick41 Rob

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    I'm new as well and by the talk here I take it micro bubbles aren't a good thing. Any reason other than they don't look good in the tank?
     
    Sidekick41, Apr 17, 2013
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  14. Cliff

    Steveg229 Addicted

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    Nope, we just don't want them in the display tank.
     
    Steveg229, Apr 17, 2013
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