1. I feed mine every other day
2. I don’t use any rocks in my enclosure but I would suggest using rocks that are at least the size of their head. This way they won’t accidentally swallow them.
3. If you’re concerned about the rock, contacting a vet would probably be your best resource.
4. I have a tetra whisper 10i filter for my ten gallon tank and it works pretty well and keeps the water clean.
5. I wouldn’t worry too much about the light cycle. I have a uvb light for mine and I turn it on in the morning and off at night, I don’t have specified times set.
6. Ive heard that waxworms are a good option but only occasionally because they’re high in fat.