I have one and they are quite high maintenance. I have to go out on walks every day to pick weeds for him to eat. You also need a decent size inside enclosure (at least 6ft x 4ft and not a glass vivarium) with correct temperatures and outside enclosure, preferably with heat and UV so they can stay out most of the year. He has just woken up from 8 weeks in the fridge hibernating (box method isn’t very reliable). They also prefer to be alone as otherwise one will dominate and stress the other.
There’s a lot of bad advice on the web, including from pet shops.
Here’s a guide I wrote for a friend of things I’ve learnt along the way. It’s quite long because there’s a lot to know...
House - they need an open table for when they’re inside, a lot of pet shops will try and sell a glass vivarium but they’re not good for them because they get too hot and you can’t control the humidity (also the glass stresses them out) so an open table with a mesh lid is best. You can also use an Ikea Billy bookcase or similar lay on its back and use the shelves to reinforce the back. Obviously they eventually grow to like 12-14 inches so you’ll need something bigger once they’re older.
Hide - they need some form of hide (like a little log tunnel) filled with sphagnum moss that you dampen every day, this really helps their shell
Heat and light - they need a basking/heat bulb and a UVB bulb on for 12 hours a day. It should be 32 degrees under the basking bulbs. The other end should be around 21 degrees
Substrate - a lot of pet shops try and sell bark, woodchips, sand or tortoise branded stuff but they’re all not great and can be dangerous if they swallow it. The best thing to use is normal topsoil you can get from B&M etc. You need to spray it every day so it stays damp. You can also use coco coir bricks (can get that from Amazon)
Bathing - you need to give them a bath every other day for around 15 minutes as it helps their shell and they also drink during it, they should have a water dish in their house as well though
Food - they should eat weeds and plants like plantain, sow thistle etc. The best website to check if they can eat something is www.thetortoisetable.org.uk you can search everything in there. If you buy anything from a garden centre, you need to repot it into fresh soil and wait 6 months before you feed it. people feed them fruit and veg, lettuce, salad from shops etc., they shouldn’t eat that as it’s really not good for them. Shop bought stuff is really bad as it has no nutritional value and often has additives. Fruit has too much sugar and upsets their stomach. They should eat their food off a slate tile as it helps to keep their beak trimmed
Outside - ideally they should be outside during the summer as it’s the best for their shell so they need some form of secure outside enclosure, preferably with electricity for heat and UV.
It is also best for them to hibernate as otherwise they grow too quickly. Best to use the fridge method to ensure consistent temperatures.
Also it’s dangerous to let them wander freely around your home, even for short amounts, and handling them stresses them out.