AHA! found the culprit! "Algaecides and medications can be detrimental for the balance of phytoplankton and zooplankton. Destroyed in large numbers, zooplankton will no longer feed off the planktonic green algae, but further contribute to a nutrient accumulation, progressively Aquarium Photofueling the algae bloom." i killed all my zooplankton! hehehe.
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