In the minimal agitation procedure I use the tube is filled with enough Pyrocat working solution to completely cover (and some) the negative while the tube is in an upright position. The initial "roll" of 1 minute is critical to even development. After which I roll the tubes in water for 15 seconds every 3 or 5 mins until the end of the cycle. As long as your tubes can satisfy these criteria then it will be fine.