Spawners spawn between y=30 to y=100. Different types have different rarities. You can find aquatic mob spawners in ocean biomes.
Money making using Spawners
- the range the player needs to be in for the spawner to be active
- the range mobs are spawned in
- the minimum delay in ticks between spawns
- the maximum delay in ticks between spawns
- the amount of monsters spawned per cycle
- the maximum amount of nearby monsters
The spawn range and player range are displayed with barrier particles when you right-click the spawner block. Using these upgrades you can setup multi-spawners from spawners that are placed or generated close to eachother. With higher upgrades the price gets higher.