Sudden Alkalinity Drop

[KennyKen]

So last week my dKh was around 8, and today i noticed a few of my zoo's closed right up so i tested it and it was down to 1.
what would cause such a sudden drop. ?

Im using the b-ionic 2 part calcium dosing, and im not really getting an accurate calcium reading from my test kit ( i will try and scoop a new one tonight)

I havent done any water changes, and have been pretty consistent with the dosing.

1) What could have caused such a drastic drop

2) The supplement says 1ml/4gallon. Should i increase this ratio to try and boost it up faster. or stay calm and stick with it.