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Green water/Algae

Discussion in 'Water Features' started by agm, Aug 12, 2008.

  1. agm

    agm LawnSite Member
    from NM
    Posts: 167

    Can someone help me as to how to control algae that is growing in the pond, especially on the pond liner? The water is turning green and on the waterfall, it keeps turning black (algae, moss?) I wash it off with my hose but it comes right back. I have 4 fish in my pond (Koi) and 3 turtles. I have a pretty good filter and have several pond plants. Can someone please help me? I am new to this pond stuff.
  2. agm

    agm LawnSite Member
    from NM
    Posts: 167

    can anyone help?
  3. tadpole

    tadpole LawnSite Bronze Member
    Posts: 1,216

    Algae growth on any and all pond surfaces is normal. It becomes a problem, much as any other plant, when the growth becomes rampant. Overgrowth of algae is controlled by limiting the available nutrients. This is done by: NOT overfeeding the fish, NOT having too many fish, controlling run-off from the area surrounding the pond, having enough plants (a sufficient number of aquatic plants will out compete the algae for nutrients and thus starve it). Invest in an inexpensive Water Test Kit. The results will indicate which areas need attention, such as whether or not your bio-filter is of sufficient size.
    As an aside: Turtles are not recommended in ponds housing decorative fish. Box turtles will eventually eat all of the aquatic plants or, even worse, if you have snapping turtles, they will eat all of the fish.
  4. XStream Aquatics

    XStream Aquatics LawnSite Member
    Posts: 239

    Green water is a primary source of to many nitrates. Almost always having enough plants will cure this problem. Tadpole is correct with is post. What type of filter do you have and are you maintaining it?
  5. n2h20

    n2h20 LawnSite Senior Member
    Posts: 503

    how often are you cleaning your filter? clean it weekly.
    do you ever change out any of the water? 10% a week will help keep the nitrates down which will starve out the algae. when you "wash" it off, do you remove it from the pond? if not it will sit at the bottom and rot, providing more
    "food" for new algae.
  6. XStream Aquatics

    XStream Aquatics LawnSite Member
    Posts: 239

    If you have a skimmer with proper sized pump most of it will get caught in the leaf net or biofilter, that's why we always say clean your filters afterwards. Also you can use a net with small holes to skim the surface.

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