probably a dumb question.

Thanks to Brian I have another unicolor tank that I will try to use to develope with. Hopefully this will take care of the scratches I get with tubes the hassel of tray processing. I was reading the instruction and they say to roll the things very forcefully. This does not make since. Do I really knock it off it's base "Smartly" and roll it back and forth smartly as well?

Am I right in assuming I should roll it back and forth steadily and not "smartley"?