yes, of course a discus sleeps. Every fish sleeps.
You
its a way of cleaning them, sometimes, but othertimes it could be them pumping blood through their bodies.
rams, cardinal and rummynose tetras, corydoras, and BN plecos those are the best, there are a few other, but take caution
You usually hold it flat in your hand, with the tips or your fingers slightly curved around the edge. Your palm should (depending on the size of your hand) be around the center of the discus. You hold it mildly stretching your fingers apart, and your release should consist of squeezing the disc from your pinky to your index finger, while throwing the disc flat, to get the most wind resistance out of the disc.
discus throw
Bernd Degen has written: 'Pr\\' 'Discus in the Community Tank' 'Degen discus book' -- subject(s): Discus (Fish) 'Wild-Caught Discus' 'The Proper Care of Discus' 'The Discus--\\' -- subject(s): Discus (Fish), Pictorial works
A case for holding a discus.
1.50KG
The plural of discus is discuses.
The whole area is the cage, but you throw from the ring.
throwing a discus?
Discoteuthis discus was created in 1969.
the ring, or discus ring - though this ring is used for hammer throwers too. 8'2" ring is sunk 20mm down in concrete to provide an edge.
The Devil's Discus was created in 1964.
Discoteuthis discus was created in 1969.
Blemus discus was created in 1792.