04-03-2011, 03:38 PM
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That is very true, but if there are no live plants in the tank, any light will cause algae. Algae is just a plant, so it needs light and nutrients. Live plants will keep it under control because they out-compete algae for the nutrients and light.
Algae is natural in any water system, and if you don't have live plants, it is not really a problem. It coats plant leaves, literally choking them, which is its downside, but in plant-less tanks, it is actually useful as it uses the nutrients.
By the way, doing small water changes wil have little if any effect on algae.