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Basically, I have the following set up in the nether roof. (Version: 1.19)
I made an 8x8 nether rack platform, and it goes up by about 100 blocks. The biome is the Nether wastes. Will this eventually spawn a ghast? (I've been struggling to get ghast tears because they keep falling in the lava ocean, so I want to spawn one in the Nether roof to easily get ghast tears.)
According to the wiki, you would need to be in Nether Waste, basalt deltas, and soul sand valley biome. You are in Nether Wastes, so that's fine. You have a 8x8 platform, they require a 5x5 or more. Ghasts require 4 blocks of free space above the platform.
Is there a nether fortress below?
Yes this will work eventually, however due to the heightmap of mob spawning - where mobs spawn less frequently at higher Y values, you aren't leaving many spawn spaces available.
You can restrict the spawning to just ghasts by including a light source as ghasts spawn at any light level but zombified piglins need 11 or lower - and this should net you more ghast spawns
