The nitrifying bacteria cause what is commonly called “The Nitrogen Cycle”: All ponds, aquariums and lakes go through a nitrogen cycle. The nitrifying bacteria are integral to the cycle. During the initial stages of the cycle, Ammonia is produced by fish respiration and fish waste.
Algae grows in various forms, Filamentous algae is most common, it grows in strings or mats – often on the surface. Planktonic algae causes green water. It is millions of individual cells that cloud together. Chara is a weed-like form of algae.
Nitrogen is essential for all living cells. Air is about 78% nitrogen gas however, most plants and animals cannot use nitrogen in gas form. Nitrogen must first be consumed by microorganisms that in return is consumed by plants and animals.
During the summer months, many pond owners are plagued by String Algae. String algae are fibrous green strands of algae (which can look like long strands of green hair), which can grow out of control if not kept in check.