There is no specific way I could tell you. Everyone's reactor and pumps are so different, not to mention the pellets. Also, depending on how many pellets you are running will depend on how they tumble. With mine, the more pellets I have the more even the tumble. I run a mj1200 on mine with a valve to control it, but now after having it running for so long I run mine at max tumble with no issues.
This is the exact rate of tumble I have in mine. This is a little aggressive flow for most, and I would suggest tumbling this fast until after you have had steady low parameters and are trying to keep them there, because you can feed your corals so much more at that point.
http://www.youtube.com/watch?v=COSaqcdkZNA
thats very slow compared tto mine
If you are having issues with channeling or its tumbling only on one side, make sure the reactor is not clogged with anything. But also, just because some of the pellets arent moving as fast doesnt mean that they are doing their job. Only be concerned if you have pellets that are literally not moving at all. If you cant remedy that, I would look into getting a better reactor.
