Do fish sleep (aquarium fish)?

Question

We have a new aquarium, and have several species of fish in it- some are super hyper and some just chill in little schools.

What i want to know is do they ever sleep?

i don't think i have ever not seen the top swimmers not moving at a fast pace.

and if they do how long do they sleep.

They sure do move around a lot and i'm sure they must get awful tired after some time.

We have guppies, neons and tetras and glowfish, as well as a one of those catfish like algae eaters i think they are called placos.

The neons and the glowfish are super hyper fish.those are the ones i am talking about-

Answer 1

They also sleep but with their eyes open.(duh they don't have eyelids like us)
i also saw my flowerhorn sleeping behind the bubbulator with its eyes open wide. they also don't swim and move their fins when sleeping