Like any other creature in the world fish need their
sleep. When you turn the lights off the fish will start looking for a shelter
for them and get some sleep. You can see that if you suddenly point a flashlight
toward them the will start swimming in a dazed matter and look for a new hole
to hide in.
If you won a
plant aquarium you should keep the lights on for 9-10 hours a day, try avoiding
a direct sunlight on the aquarium which leads to a rapid growth of algae. Don't
ever leave the light on for 24 hours because just like you the fish their sleep
and it is very necessary in order to keep them alive.
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