Hello, I just got into kegging this weekend when I purchased four (4) mini kegs (1.3ish gallons each). Needless to say, I am very excited about starting this process but one part that had me shaking my head is filling it. I know to only fill the keg to within an inch of the top, but with all of the Star San bubbles, I could not really see. As a result, I underfilled my first keg and may have overfilled the second keg. So far the potentially overfilled one appears to be fine, so I may have dodged a bullet (or an exploding keg). However, it would be nice to take as much of the guess work out. I even used a flashlight, but those bubbles made it entirely impossible to see how far up the keg I had filled. Does anyone have any tips for this or any tips for mini kegs in general? Keep in mind I am talking about MINI kegs, not regular kegs so there is no regulator, gas lines, etc. I only do 2.5 gallon batches, so I didn't feel it was worth going to a full-scale keg setup. Anyway, thanks in advance for any tips you guys have! Happy brewing!