I'm a major first timer so I only got one for now but here he is I named him Monster

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I didn't keep him in that tiny tank you see him in that was only temporary. It was very late when I got home and I was too tired to get him set up in the 10 gal so I kept him in the 2 gal over night. He's now in a 10 gal tank!

Some questions that I have..

He's doing fine alone do I absolutely have to get him a buddy or will he still get depressed?
How often do I have to feed him? I'm being told 2 different things..
I was first told 3 small crickets 3 times a week and then i was told 5 large crickets everyday..

My room upstairs gets very hot and I have the heater set to 75 degrees but it never kicks on because the temperature on the thermometer is always telling me it's 80 degrees is that too hot? if so what can I do to cool it off?

Is it true they can choke on aquarium gravel? >.>

I currently have:
Heater
Filter
Aquarium gravel for substrate
A log fish decor for an island (i'll be getting a bigger one this weekend)

What else could I get him to make him comfortable?

Sorry for all of the questions I'm just really excited and nervous at the same time >.<