I just recently purchased a 2 liter bottle of Excel. I have never used it before, and have heard an overdose can cause shrimp death. I do have 2 cherry shrimp in the tank I am adding the Excel to. On the bottle it says the initial dose should be 1 capful for every 20 gals, after that 1 capful for every 100 gals. However, on your website, the directions state 1 capful for every 10 gals, then 1 capful for every 50 gals. Which is correct? I don't want to kill off my shrimp due to mislabeling.