Mob Farms - Tips and Tricks

Did you know CoolGuyy found out that the fall damage required to kill mobs on /pink is a little more than on /blue. He found out that on /pink the necessary fall damage is:

Cave Spider=34 blocks

Spiders=20 blocks

 Skeleton & Zombie=25 blocks

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Share your tips and tricks for mob farms below!

(Don't forget we have rules for spawners and farms on the wiki.)