04-29-2009, 01:33 PM
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Algae feeds on nitrates, nitrates are not a nutrient, but a toxin; the third and final toxin to convert in the nitrogen cycle. Even weekly water changes will not eliminate algae; maybe if you performed daily changes, but that would reek havoc on your nitrogen cycle.
Although we don't like the looks of it in our glass aquariums; it's actually a sign of a very healthy tank; and the goldfish love nibbling on it; it's very nutritious.
Under the right conditions; a cycled tank producing plenty of nitrates, sunlight or a plant light and algae blooms.
I have a stock tank and encourage substrate algae; it helps reduce nitrate levels and is a healthy treat for the goldfish, and I don't have to worry about it spoiling the looks of my tank.
Warning; after you remove algae from your tank or pond, be it green water, string or substrate algae; keep a close watch on your nitrates; levels can and will spike, injuring your fish. Increase your water changes for a while.