Josh your alk acording to hagen is perfect.
I am assuming it took you 19 drops to change from blue to yellow?
If this is correct your alk is 3.8 meq/l or 190 x .056=10.64 dkh.
Dont go by what the book says your range needs to be go by what is actually needs to be.
Acording to the book your tank alk needs to be 2.0meq/l or about 5dkh which is kinda low.
What you want to test is your calcium now.
It should be about 400mg/l to 440mg/l if it's in that range your good to go.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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