there may be phosphates bound up in your rock that will slow your progress, basically you have to get rid of the existing algae+phosphates in water+phosphates in rock/substrate before the numbers really decline.
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Is there any other creature I could try to eat the algae?there may be phosphates bound up in your rock that will slow your progress, basically you have to get rid of the existing algae+phosphates in water+phosphates in rock/substrate before the numbers really decline.