Got my first Hanna test and it’s for magnesium. I’m a little confused though because I watch tutorials on YouTube and read the packet they send and it says to pull the reagent and tank water to 4 or 5 ml in the syringe. But in videos, everyone pulls the syringe to 5 or 4 like it says but in reality they got like 3ml in the syringe because of air. Is this normal or do you need to get the whole syringe full?