Christine, there are a couple of ways you can deal with your 'Filler Fridays' now.  You could add a filler like before, then move it over to one of the other series, like Maxy... or you could simply add your filler comic to the Maxy series and it will show up here automatically, since it's newer.  Any comments and such will stay with the comic.

If you need a new series created, that can be done too.