ULTIMATE GHAST FARMThe concept is pretty simpleOnce squid plants are grown they eject squid entity's upward and when they fly up they touch the witch water and become ghasts.What do you need?An area of free space of 7x7x97x7x7 box (Solid blocks of any kind) Total of 133 blocks needed for full containment1 bucket of witch water1 Squid Plant seed1 Bucket of water1 SignBuildIts pretty straight forward1x1 hole 3 blocks high|Sign| On top|Squid plant| In middle|Water Block|On bottomand inside of the 7x7x7 box you place 1 source block of witch water7x7x7 containment on top of the 1x1 hole in the middleAnd there you have a ghast farmHow you choose to kill it is your choice however grinders are ideal----I like having an activator apply bone meal to one squid plant for a good amount of ghast spawns per minute. The only real downside to the build is the "faint" ghasts can fly though blocks like a ghost spider can.So in short at the cost of bone meal you can get ghast tears, and gunpowder at a fairly decent rate.​