Does anyone know the best way to keep algae from growing in my pond?

| October 29, 2013 | 3 Comments

Question by GrYpHoN: Does anyone know the best way to keep algae from growing in my pond?
I’ve tried using all different types of chemical algae remover, but the water usually turns green within a week! It’s a small 200 gallon store bought pond with about 40-50 goldfish in it.

Best answer:

Answer by dragoncreep
thats too many goldfish

scale it back to about 20 or 25. its too small of an environment for the bacteria the fish create. also, try getting some snails from the pet store they help

also, you didnt mention how efficient your pump and filter are that makes a difference

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  1. Jeff says:

    I think a UV filter would do…. it is like a tube that has UV emitting bulbs such that when the water passes through this contraption the water is sterilized…. it is vital to place this after your biological filter so as not to kill all good bacteria in your biological filter

  2. frank says:

    to many fish had the same problem scaled back to 10 no problems now

  3. Rob E says:

    Algae needs 2 things to proliferate and grow in a pond – sunlight and nutrients. Whatever you can do to restrict these will reduce its ability to grow.

    Consider shading your pond somehow, either with large leaved plants such as water lillies (summer only), floating decorations (I have a floating hippo, who is cute), or some plants nearby that could shade. Remove any debris from dead plants that falls in, and avoid tree leaves in autumn/fall – preferable keep trees away. Also ensure that there is no run-off from your garden coming into the pond, that will carry soil borne nutrients.

    Fish produce waste which feeds the algae, so less fish will help too.

    There are also products that kill algae that are safe for animals such as fish and wildlife, and I’d recommend using these, to bring it down under control – though if you can minimise the causes, not just the effects, it’s easier still.

    There are different types of algae – green slimy, or long filament like stuff (spyrogyra) are the most common. I sue Blanket Answer (, for the filamentous algae, and have experimented with other types, with good results, for the general slimy algae.

    I’d recommend a visit to your local pond supplies place, and see what the recommend for you, as well as stocking less fish and reducing /removing any sources of other waste. Plus a floating hippo head, or surface plants, who will compete with the algae for the nutrients.

    Hope this helps. Good luck! Rob

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