How too much light can produce algea in aquarium? Is it right

  • There is no such thing as “too much light” for a fish tank unless the tank is kept outdoors. Water is transparent to light. If the light is too strong, the fish can develop eye problems. Algae, on the other hand, can grow rapidly and make the water look green. Although algae is a plant, it is not desirable in the fish tank as fish food.

  • I think the term "too much light" really can mean "lights on too long" since fish require to have a day and night cycle like humans and other species (unless you talk about species that live in pitch-black their whole life). Algae can grow in either condition where there is excess light, or sometimes when there isn't truly enough (it may appear discolored as it's growing and dying at the same time).

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