Phosban Media Question

Just a quick question. I couldn't remember how much media to use in my phosban reactor so just trying to remember.



I currently use the brown granule and started without just a little so the tank got used to it.



Last week i added a lot more so you can see the stuff move but not a lot.



This weekend i'm going to switch to the pellets due to nitrate levels.



Can someone tell me how much i use for the pellets? Is that correct that you need enough room for a good tumble effect??