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If you have the Gravestone mod installed, there's a block that spawns in the crypts called a Thunder stone (?) that makes it starting raining and thundering when you walk over it
Ahh sorry my bad. Well the xp shower requires a redstone signal so just use a turtle to detect if your tank is full then cut the redstone signal and the xp will stop flowing
In the newest open blocks update there's an xp shower that does exactly that. Just stick it on an xp tank and it will literally shower the xp which can go into an mfr sewer