I use the tubes for all my film processing. After the tubes are in the tray of tempered water, with the lights out, I remove the cap and pull the film about half way out of the tube and kind of move the film around so water reaches the back of the film. Put the cap back on and turn the lights back on. I presoak for 5 minutes and use pyrocat hd to develope. Hope this makes sense and works for you.