My dog is dying of cancer so I took him for a nice long day at our local park. Some teenaged boys came up to pet him and started laughing about how they threw their turtle in the cold pond because they were "tired of caring for him". I flipped out....yelled at them, went looking for the turtle....found him 45 minutes later. I live in Arizona- the pond water was somewhere in the 40's (degrees F) and he was in there for forty five minutes before I found him. He was slowed down enough that I reached in and grabbed him. I called a herpetologist who told me he would surely die in the pond, so i took him home.
He spent the first 24 hours in my 70 degree home slowly warming up as the herpetologist said no sudden changes in temp. I put him in wooden box with a blanket and some rocks. The next morning I bought him a home to get us by until I can afford better (my dog's medical bills have depleted me). I was able to spend $400 to get a basic aquatic turtle starter home kit with an added on top grade turtle filter (Turtle Clean 501 External canister filter), water heater, basking deck and tunnel for hiding. Here is his current set up:

I already know from reading that he needs a bigger home soon and I have to get rid of the rocks at the bottom and replace them with larger ones (I asked the idiot pet store manager about the rocks and he said that was a stupid myth...then I read posts here- the manager was stupid and its not a myth, I need bigger rocks).
He hasn't eaten yet. I have a food made of dehydrated shrimp, worms etc called ZMG Zoo Med Gourmet Aquatic Turtle Food-have offered that and radicchio, romaine, blackberry....no luck yet but the water temp was 72 for first few days, then I got the heater so its now at 78-80 degrees and has been that way for a day. I'm hoping I see him eat soon. If not he will go to the vet sooner rather than later (my vet who sees my guinea pigs is an expert herpetologist, so I plan to get him a good check up as soon as I recover from all my dog's recent medical bills, sooner if there is any evidence of illness but none so far).
His shell is very hard, uniform and healthy. His skin also appears quite healthy, he has some light shedding in the warmer water now. I have seen him yawn and use his paw to clean himself (which is very cute). He was basking alot when the water was colder, now much less since the water is warm.
Questions:
1.) I read its normal for them not to eat at first. At what point will it become medically concerning that he's not eating? Got him on Wednesday, nothing yet but remember the water was at 72 until yesterday.
2.) is he really a he? I think his front nails are long, but not as long as some of the pictures of the male red eared sliders I see online....the bottom of his shell seems totally flat, not concave:


3.) Did I forget anything major? (used drops for the water, have a UVA heat lamp and UVB lamp, basking deck temp is around 85 degrees).
Thank you for the help




