Is this blood in the stool?

[rpguzman]

Hi all,

I've had a sick little striped keelback with a nasty case of mouth rot for the past month. I took my little snake Lily to the vet after a week of trying to treat it at home with betadine and hydrogen peroxide. On the advice of the vet, we tried one antibiotic (while waiting for a culture to verify the bacteria), switched to another antibiotic (after the bacteria was verified to be resistant to the first broad-spectrum antibiotic), and all the while staying on top of the topical treatment with a betadine solution (minus the hyogen peroxide). Today I was cleaning the viv and noticed the stool looking a little dark. I wondered if this is blood or what. I had force fed her two thawed pinkies a couple of days ago (and some pinkie parts the previous week), as she had stopped eating around the time I noticed the stomatitis a month ago. She also underwent a shed a week or so ago, and has been looking especially thin.

1. Is this blood in the stool? (See picture attached)
2. In your experiences, how long does it typically take for stomatitis to subside?