Well, after a couple of trials, and an overflow accident, i resolved the traffic jam issues. Media is now constantly on the run, boiling.
I shoild point out that i reduces the media to 3/4 of the initial gallonnage i bought, and will add the rest slowly.
This was pointed out by Dyodysis and it improoves the effectiveness of the reactor.
you will find the amout of media you end up with will be a waste of time and the sump space can be better used with other media
which is why i said its best to try running the reactor as a stand alone unit
just out of interest what media did you remove to make room