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Message: [QUOTE="crsublette, post: 159064, member: 3847"] All algae and plants can be eventually become toxic to water quality whenever they are allowed to become overgrown. Water hycanith becomes so invasive in some rivers that the plant actually suffocating the water. Also, even in lakes and rivers where there is heavy plant presence, significant algae blooms still occur. There are many many many species of algae and pond owners have limited access to only some. I have read of folk never having algae problems until the one day a particular plant was introduced into the pond that had a algal species transporting on it that has never been in the owner's pond. Big fish farms encourage huge algal blooms to be a biofilter and feed fish, but these farms also significantly increase there KH very high and inject products for oxygenation. [/QUOTE]