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Discussion in 'Advanced Growing Techniques' started by andrew256, Sep 24, 2009.
Title sums it up.
Is it (bubble cloner) light tight? What temperature is the solution? Scum generally occurs from light leaks and/or high temps in the solution.
Adding a small dose of hydrogen peroxide will clear up your problem....but, its better to make it light-proof like chunk said.
What chunky said. Add more air stones, light proof it, and regularly change the water.