rocks are turning green


Old 07-30-05, 09:04 PM
Roeboat109's Avatar
Thread Starter
Join Date: Jul 2003
Location: Illinois
Posts: 502
rocks are turning green

we just built a small 4 footx 4 foot pond and put a filter that was supposed to handle it .we put some small light rock in the bottom to brighten in up so we could see the gold fish better which we also put in . the rocks are already turning green.the filter seems to be working.what can we do to keep the rocks from turning green ,if anything?we have a fountain in it to keep the water moving.we leave in on all the time. any help will be appreciated.thanks.
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Old 08-01-05, 10:47 PM
Join Date: Aug 2000
Location: USA
Posts: 15,834
Limited amounts of algae are a good thing. Algae is a necessary part of a healthy, balanced pond. But, you can have too much algae, especially if it becomes suspended.

Fish ponds without adequate plantings are most susceptible to algae bloom problems. These ponds are usually well stocked with overfed fish. The absence of aquatic plants eliminates competition with algae for available nutrients in the pond water. Do not overstock fish or overfeed them.
Old 08-06-05, 07:35 PM
fewalt's Avatar
Join Date: Feb 2001
Location: sw VA
Posts: 3,100
Green rocks, and liner are normal, you'll just have to learn to live with it.

Algal blooms, (suspended green) can be controlled with filtration and water lilly shading.

Old 08-07-05, 12:32 AM
Join Date: Mar 2005
Location: NW Washington
Posts: 91
How long have you had your pond up and running? The first two months or so are devoted to cycling your pond. During this time you can expect a few algae blooms to occur, two maybe three. Unfortunately they are necessary at this point, but should clear up and be very clear when all is PROPERLY cycled. You will need to do a little research on cycling a pond and the waste products that are made. A filter isn't made to get rid of algae, just the waste from the fish. The ammonia is converted to nitrite and then nitrate. The nitrate will build up if not MANUALLY removed as no filter will remove it for you. (ammonnia is very bad for your fish, nitrate isn't near as bad, but nitrate is still poison in high consentrations.) Plants will consume nitrate as nourishment and this is why they are recommended. But you still need to watch the nitrate. Algae is a plant and will also flourish in high nitrate water. A few large water changes and increasing the amount of shade that the pond gets will help control algae. Get some test kits (bottles not strips) for your water and see what they say. ammonia, nitrite, nitrate to start. Don't worry about pH. It is a little work in research but the end product is worth it, and once it is cycled the maintenance isn't so bad. Good luck

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