I don't have a lot of experience with HITH, but after 10 days you should be seeing some improvement. As callen said, it looks like it might be infected now, which would call for antibiotic.
Let others chime in on this one, but I think the Fish Zole might not be giving you any benefits.
As far as Bio media goes in the XP3 there are tons and tons of things that can be used, ceramic rings, bio balls, bio star,bio chem, cut up pvc pipe, and even terra-cotta pots. In my XP2 and XP3 I have all my pads in there (as don described) and I have ceramic rings, bio stars, bio chem, and recently tossed in some extra bio media that consisted of broken up terr-cotta pots and even a couple of pieces of egg crate (ceiling grid) to have it cycled for when I add more filters in the coming days. You can get very creative with your filters and their media, especially since they have a decent capacity, so long as you are meeting your bio needs chem needs etc. etc.
Lookin forward to the water readings.