My fish tank goes green quicker than it used to. We got the two pretty good sized goldfish in the fall and the water didn't get really green until 2 1/2 weeks. Now we have to change the water every week if we want to see the fish. Whats happening?

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  My fish tank goes green quicker than it used to. We got the two pretty good sized goldfish in the fall and the water didn't get really green until 2 1/2 weeks. Now we have to change the water every week if we want to see the fish. Whats happening?
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