There are numerous resources to learn how to recognize the symptoms of unhealthy plants. The majority will be for soil or hydroponic growing. Do not follow recommendations for chemical supplements before learning of the affects on the fish and bacteria.
Follow the link for a quick and easy-to-understand Guide to Symptoms of Plant Nutrient Deficiencies.
From: The University of Arizona Cooperative Extension. “Guide to Symptoms of Plant Nutrient Deficiencies.” Accessed June 11, 2013. http://ag.arizona.edu/pubs/garden/az1106.pdf
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