Thanks Gary,
After I pulled it apart today I found carbon in the outlet clogging it up a bit. As instructed, I am running a half canister of GFO on the bottom of the first cell with 2 sponges on the bottom, and half a canister of carbon between sponges on the top half of the second cell. The dribbly output is now starting to erk me a bit.
Im gonna have to leave it for a few weeks as media isn't free, so I'll try your method as soon as I'm in need for a change. on this topic, I cant say I have ever seen the GFO "tumble" since I had the unit. Didn't go solid so I cant complain!