my coord: 1000 0 1000  (0 0 is the world spawn point)
and i use this commandsummon slime 0 0 0 {PersistenceRequired:1b,Size:5,NoGravity:1b,Silent:1b}
tp @e[type=slime] @p
i cant see slimes Including their box but i can hear the sound and it was attacking me