So 25 mls in 3785 mls (one gallon) comes out to 0.66 mls per 100 mls of tank water. Even though I haven’t seen any scientific studies on Bayer, that seems to be a touch on the low side. Again, the YouTube was 0.8 mls per 100 mls of tank water. I’ve also read others who do super strength dilutions at considerably higher amounts of Bayer. You might want to goose up you numbers slightly, to add a touch more Bayer.