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In a poorly lit aquarium, light is likely to be what limits the rate of plant growth. The amount of CO 2 produced by fish- and bacterial respiration is more than enough to allow photosynthesis under these conditions.
The short version is 1  -. Algae is beneficial to fish the same way that plants are - they convert nitrate to a usable nitrogen source for consumption with the byproduct of oxygen. 2  Algae is beneficial to snails, fish and other organisms that may eat it. 3  It is an indicator of adequate (or excess) nutrients in the ecosystem.