I'm not familiar with Reptile City, but sorry for your loss.
WE have great breeders on here who can always help and support you, and give you the best information ever.
They start their babies off the right way to limit the death of baby tortoises.
Sometimes the death can be linked to a number...
I gotta go with @wellington on this one. The care sheets on here are great and very very helpful.
This is a prime example of the misinformation that is put out on the web and is given in pet stores.
Yikes!!!
https://www.tortoiseforum.org/threads/russian-tortoise-care-sheet.80698/ Give this a quick read.
https://www.tortoiseforum.org/threads/closed-chambers.32333/ This will be really helpful.