1. I'm exhausted. 2. I'm dead tired. 3. I'm pooped. 4. I'm spent. 5. I'm beat. 6. I'm running on fumes. / I'm running on empty. 7. I can hardly keep my eyes open. 8. I'm off to bed. 9. I'm gonna hit the sack. (hit the sack = go to bed) 10. It's bedtime for me.
The Red-Tailed Shark is not really a shark, despite its triangular dorsal fin and its common name. It grows to a length of 5 inches and is not particularly fond of its own kind. Either just one or a group of at least 4 or 5 should be kept in a tank.
Living Environment : It does well on flake and freeze-dried foods. The Red-Tailed Shark is among the more attractive bottom dwellers, but its color will fade in poor-quality water. It is best to provide hiding places, and the Red-Tailed Shark prefers to have strong currents in the tank.