I mean, I suggest to keep the pump at full speed for an AIO, and the Dan of course depending by the CPU temp. Of course if the fan header you choose support the DC mode, you can have a curve for the pump depending from the CPU speed as well, but I will not go below 60% for the liquid flow. Of course depends from the pump power! Maybe @AseDen has a better advice!
ohhh.. well it will be my first AIO ever, so all the info and recommendations are very welcome to me.