Raised the tip to 80F, I'll raise it up to 82 when I get home from work, then maybe 84 before bed. I added a little bit of salt (about one tablespoon) to the tank, and will add more every few hours. I also added a pump and air stone to help aerate. Here's an updated shot:
I did notice that he kicks sand up as he's sifting around the sand looking for bits of food, and some of it does get on him. So I'm still hoping it's just sand but would rather be safe than sorry.