1. Sand:
My 9" fahaka still buries himself. I currently have mine in silica sand,
however his markings are rather dull with it. When I went to go pick him up a few months ago he looked a lot better with black gravel. I would go with
darker sand if I could start again, brown, maybe black.. I know my puffer would look a lot better. However I admit silica looks good in my tank.
2. Food: This is perhaps my biggest concern. I would love to know more specifics on feeding. I know I need to mix it up and make sure to give him hard food for his teeth, but I have no idea where to get it how to feed it.
Should I raise my own crayfish? Should I buy frozen food? How often should I feed this or that food etc.?
I've probably fed mine crayfish twice. I started from a week on earth worms -> silversides (phallic looking lol, I think that helped) -> seafood medley that you can buy at your grocery store with less than 4 days of starvation at each tradition. He's healthy and still adding on size every time I measure.
3. Enviornment: I have driftwood, I assembled a cave with 3 large pieces.
They like caves from what I understand (I know pufferpunk can vouch this). Mine only was interested in plants (although I have very little, and they are fake) the first day I put it in. He actually bites one of them constantly and spits it out (thankfully).
4. Water: Toronto tap water has ph around 8 as well. Your puffer will be fine.
5. Petting: I pet my fahaka. Not like a dog faced puffer that I've seen videos of, but more like a quick stroke on his back with my index.
It's true what they say, be prepared to upgrade that tank quick, otherwise your puffer will be stunted/deformed.