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changes On the Mathematics of aquarium water changes On the Mathematics of aquarium water changes chemistry Algicides Substances used to kill algae in the aquarium. Ammonia The most dangerous chemical naturally found in aquaria Chlorine Ascorbic acid is the safest and cheapest way to neutralize chlorine and chloramine. Cyanide Cyanide occurring in freshwater Ferts Aquatic plant fertilizers Hardness Water hardness History History of aquarium chemistry Nitrates Hobby test kits are not accurate, and nitrates may not be as harmful as people believe. Ph Acidity and alkalinity Schreckstoff "Fright" substance grey

temperature algae