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# Algae

## Blue Algae, Cyanophyta

Causes: - Low oxygen, slow water circulation. - Excess organic debris accumulated. - Feeding excess, too much nitrogen. - Low light or too much light. - High temperatures and dirty filter. May appear in combination of these factors. Solution: - Improve water circulation and oxygenation. - Clean ground with siphon - Clean filter, regulate photoperiod - Plant high growth rate plants to compete with algae.