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  1. #1
    Join Date
    Jan 2014

    newbie question on FT to GB ratios

    Hi :
    I have a preexisting 7x9x2.5 foot (approx. 1200 gallons) pond that I would like to use for aquaponics. The area that I intend to use for a GB is only 12x2x1 foot ( 180 gallons). This would make a completely backwards ratio of FT:GB of 5.5:1. Is this worth even trying? It currently has a 2000 GPH skimmer filter with a waterfall that has a diversion valve that could feed the GB or I could add an additional bottom pump. It currently has about a dozen 4" gold fish and 3, 10" koi. I was hoping to raise either hybrid striped bass or bluegill. I could add a separate FT if necessary but I am hoping to avoid this if possible

  2. #2
    Aquaponics 101 Oliver's Avatar
    Join Date
    Mar 2009
    Show Low, AZ USA

    Re: newbie question on FT to GB ratios


    As a quick look, I see no reason why your plan will not work. There are limitations and those have to do with the size of your grow bed. I am assuming the grow bed(s) are media filled. If so, then you will be limited to about 30 pounds of fish. With the amount of water in your system, it will require a little time for the nitrates to build to a level where you can grow plants, but it will also stabilize your system. This will allow for a slow growth of the necessary bacteria for fish waste conversion. The system will take some time to cycle but you need not worry about getting ahead of it due to the low fish density.

    I am not familiar with raising your choice of fish but be careful to limit your total weight to what the grow bed/biofiter can handle and be sure to aerate your pound. Please read Aquaponics 101 on this forum to get all the numbers.

    To measure is to know

  3. #3
    Join Date
    Jan 2014

    Re: newbie question on FT to GB ratios

    Thanks for the info! Do you think I can get away with diverting water from the top skimmer filter or would it be much better to have a separate pump from the bottom of the pond?

  4. #4
    Members dead_sled's Avatar
    Join Date
    Jan 2012

    Re: newbie question on FT to GB ratios

    I would estimate that you need about 350-400 gal/hr flow to the grow bed. This should allow it to cycle about 4 times per hour, assuming you use media (rocks, expanded clay, etc) in your grow bed. If you can spare that much flow from your filter, then give it a try. Personally, I think I would just get another pump, a bit oversized, and run the grow bed off of it.
    Less irritating avatar since 02/27/14.

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