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String Algae/Pump Filter

Posted by lola6964 5 (My Page) on
Sat, Mar 29, 14 at 20:20

I'm in Zone 5 and have 2 half-barrel ponds, with three small goldfish in each. I've kept the filter running, as well as a bubble stone in each barrel over the winter. I also put small stock tank heaters in each to keep the water from freezing, which kept the water temp at about 40 degrees all winter. I fed the fish 1-2 times per week, which I now see I shouldn't have done.

I have a Tetra Whisper filter and am wondering if I should change the filter cartridge? I've rinsed the cartridge with pond water several times to clean it, but it is looking really grungy. But I don't want to remove the good bacteria in the existing cartridge if that's going to be an issue.

Also, what to do about the massive amount of string algae? I remove some weekly with a toilet brush, but as my ponds are so small, there's so much in there that my fish can hardly swim around. Or will it dissappear on it's own once my plants start growing again?


Follow-Up Postings:

RE: String Algae/Pump Filter

Hey there lola. The filter may very well be clogged. It probably needs a more aggressive cleaning with just a good jet of water. The bacteria will regenerate very quickly.

The string algae can be controlled with Hydrogen peroxide. With such a small size to treat you won't need more than a couple of ounces per treatment. I would put the peroxide in a squeeze bottle to better control where it goes. Spray directly on the algae. I would direct it to the sides of the barrels. It won't hurt the fish and you can repeat the treatment in hours. It could be just minutes but why push it for a newby? It breaks down very quickly.

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