Hi, 1) I have a bottle of Photo Flo concentrate. It says the working solution is made from 1 part concentrate to 200 parts water. A friendly Apug' er told me he mixes 5mL of concentrate with 1000 mL but I'm really only interested in making enough for two rolls at a time in a 650mL tank. Would really appreciate some help figuring out the proportions. 2) On a related note, I notice that on my dried negatives, there are streaks. Is this the Photo Flo residue that didn't quite drip off completely? To get rid of them, I use Rexton Anti static film cleaner with PEC pad non abrasive wipes. But what's the solution to avoiding these streaks? Thanks, Robert.