Well, uhhh whoops? 1 drop is about 1 mL right? So I don't think 1 tbsp is too far from 15 mL. I was pretty sure I was close to what the box said. It will only be in there for 3 more days since I am going to change the res on Friday anways to start flowering. Do you think its that big of a deal?

Also, I don't need to know the size of your res Weedhound. I was stoned and thought that was info I needed.

Also, when you say 2 tsp per gallon, is that for 35% H2O2? Because that's what I have.