Slime spawners?

[Blackjack]

So I recently purchased a slime spawner for a pickaxe a made, and i made a room below at lvl 20 to house it. They don't spawn though. I've seen other peoples slime spawners that work, and it's not the light level that's making them not spawn. I heard something about a slime chunk, where only slimes spawn. So if anyone knows what to actually do, please tell me.

~BJ (hehehe)

[TheAmazingAdam]

Handy said something about the U menu showing the chunks. Other than that, since seeds are masked, we can't punch it into something that will calculate where the chunks are. Unless nide tells you the seed for world, you'll have to find a slime that has naturally spawned inside its chunk.

[Handyman]

There is an option in the map menu (default key: M) where you let the map show slimechunks.

For the spawner: go all the way to bedrock, and place a spawner there.
This is something i succesfully tested.

[Blackjack]

I looked in the in the map, and there was no slime chunk options, but i talked to nide and he said he might implement slimeballs glowing in slime chunks or something.

[Handyman]

might be because of no permissions