This farm isnt super bonemeal efficiënt but it does work well
It uses a slik touch pickaxe instead of an axe, the reason for this is whitout mods you cannot plant the new mushroom fast enough since you break the blocks super fast with an axe
Schematic can be found in the Teck TMC Archive discord : https://discord.gg/dsdYF6v3
in the mushroom farm category