Two drops per gallon. So, I really don't know how the first thread turns out to be. I would suggest getting a dropper next time, though, and only put in ten drops to be 100% sure.
Do you have the larger bottle? If so, I think that the first thread is too much, and I would go back to my previous suggestion about the dropper. I just looked at mine, and I would think that the first thread would be closer to my 20g's requirements, but I may be wrong.
I guess I should've payed attention to what page was loaded. Sometimes I'll get loaded to the middle of a thread and think that's where we are, and then realize that there are actually 6 more pages following the one that I'm on.