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I very much doubt if any normal light would be brighter than sunlight which is what Bettas evolved to live under. Lights can however be too hot and raise the temperature in the Bettas tank too high for the fish to survive.

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15y ago
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14y ago

That depends upon what type of light and from what source it is comming. Bright dayligh is OK. Bright sunshine will overheat the water and kill the fish. Normal fish tank lighting is OK. Since the species is tropical and the length of the days and nights is fairly equal, 12 hours on and 12 hours off will suit them nicely. A Betta does however need at least a 3 gallon tank with its water kept at around 78F if you wish it to survive for any length of time. The basic rules for successfull fishkeeping are as follows. :- 1 inch of fish needs at least 1 gallon of water. Every tank needs a permanently running cycled filter. Every tank needs at least 50% of its water replaced every week. If you then keep the water at the required Hardness, pH and temperature for the species and feed it/them the correct food your fish will stand a chance of survival. I can guarantee that failure to provide any of the above requirements will result in sick fish and shortened lifespans.

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17y ago

Nothing he will just go and hide behind a plant or something!

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15y ago

Find a lightbulb with a lower wattage, or leave the light on for a shorter period of time (if algae is the issue).

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13y ago

All I know is excessive algae growth

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Q: What happens if a fish aquarium gets too much light?
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