However, some species are perfect for outdoor ponds because of their large sizes and beautiful appearances. Others even perform useful tasks like eating algae ... survive in cold water even ...

Small ponds and lakes are very common in the ... these strands form large mats that trap gases and force the algae to the surface of the water. It is important to realize that all types of algae ...

Often resembling green scum or forming dense mats and strands, this invader can even give the water a 'pea soup' appearance. Filamentous algae ... for pond life. However, if you have Koi fish or other ...