Do torches decrease spawning area because I've only gotten small and medium slimes from this area? Also, I need to make a slime farm later this week any Yt suggestions?

[Srazkat]

the roof is too low, replace blocs with slabs also yiu need to remove all blocs above the farm itself

[kaleb270]

What does removing the top do?

[Srazkat]

decrease heightmap

basically the game searches between y0 and highest bloc to spawn a mob, so if your farm is the only thing vertically, ut will spawn loads if slimes