The temperature settled out at about 76 degrees. I'm maintaining it fairly well with the light as well as utilizing my fan. I doubt I'm going to be able to buy a heater today, but I am definitely going to order one ASAP.
Tilly still has ich, though it's really not that bad. I'm thinking that maybe the spot on his head is a burnt or missing scale, but I really don't know. Hopefully this gets sorted out soon.