If you want to take a pic, I suggest blue light. I don't know if it's the same for fish, but people who have had severe concussions and can't stand to be under regular light use blue light and it soothes their headaches. I think he might not be hurt as bad by a blue light then a regular one. And if possible, shine it away from him at first, then on him after he adjusts.
You poor woman...I can only imagine how hard this must be for you. :(
In humans, sensitivity to light is common in concussions, and I wonder if the red spot could be that when he gets stressed his blood pressure goes up and the area seems redder due to increased blood volume?
I'm glad he ate a little bit though, and prayers continue for his recovery and for you as well as you deal with all this. :( Poor little guy, but he's *SO* lucky to have such a dedicated and wonderful owner. You are an amazing person to be willing to go to these measures for a pet, any pet. :)
We got him a 3 gallon so he could be in a small space but still have it filtered. We'll be getting a heater within the next couple of days. I hope he likes it. He hasn't eaten anymore except one pellet last night. His behavior is still way out of whack like it has been.