Hi Leslie - great to hear from you. How are you getting on with the substrate, and is it finally beginning to thaw in New York?
The diet you're giving Leaf Erikson isn't too bad, but obviously you don't want to feed supermarket food for a long period of time. You could think of growing your own in pots on the windowsill to supplement the supermarket stuff. Carolina Pet Supply sells seeds especially for tortoises, and on p.2 of their list there is a mix for Russian tortoises (Horsfields).
https://www.carolinapetsupply.com/catal ... 20a&page=2
I'd get the smallest quantity to start with and see how it goes. You could plant seeds in small trays or pots in succession, every couple of weeks so that when one pot is ready to feed another is starting to grow, and when it gets warm enough you could plant them in your weed patch in your yard. That is great that you'll be growing food for him! People spend all their lives getting rid of weeds in their gardens and then they get a tortoise and take great delight at seeing weeds pop up!
I'm not surprised he won't eat the hay, as the grazing species like Sulcata and Leopards eat a lot of hay, but Horsfields and other Mediterranean species generally don't like it. Most tortoises like the pellets, but we don't recommend most brands (which ones are you using?), because they are too high in protein (tortoises need a high fibre/low protein diet), and contain things that tortoises normally wouldn't eat (soy, corn, molasses). So I wouldn't encourage him to eat either hay or pellets (but if your pellets are one of the few good brands, I can give you tips on how to trick him into eating them).
Do you know if your vet has 'exotics' qualifications? Not sure what they call it in the USA, but here you can take extra courses in vet school to qualify you to treat what they call 'exotics' -- reptiles, birds, fish, etc., as ordinary vet school doesn't have much training in these areas and many vets are misinformed about tortoises.
What he should be having is a really good calcium + VitaminD3 supplement sprinkled on his food every other day, plus ordinary calcium on days when he isn't having the supplement. Cuttlefish bone left in his table is a good idea, or you can scrape some of it onto his food with your fingernail (and always wet the food so that the powder sticks to it).
Do you have a good UVB lamp? The UVB reacts with cells on the skin to produce Vitamin D3, and that enables the tortoise to absorb and utilize the calcium in his diet -- and they need lots of calcium to support all that growing bone and shell. The sun is the best source of UVB, but when they have to be indoors they need it coming from a UVB bulb or tube. These need to be change every year or two, depending on how much they are used (I can explain why if your are interested, but this is getting long!).
One other thing re variety in diet -- you can use the filter tool on our website to produce lists of plants that are good to feed Leaf Erikson. Just go to this page and scroll down to the section called 'How to Use the Traffic Light Filter' and go from there (let me know if you have any problems).
https://www.thetortoisetable.org.uk/pla ... -database/
Speaking of problems -- we've been having problems with the Forum and the website (but mainly the Forum) lately, and we are the process of fixing it, but it could take 3 - 4 weeks. So if you are trying to post something and get an error message, or get an error message when you try to log in, just try again and often that works (but sometimes it doesn't and you have to wait a bit) -- it's really frustrating!
Nina