Red Sea says you should (at least initially) not change the default settings for the Reefer DC Skimmer 300. I watched their video, and it shows the settings for RSK (is this the old model?). The default settings for the 300 say 70% for the pump intensity. It's easy to set, but what about the 480 l/hr air flow rate There's no way to set this as far as I can tell. Any suggestions?