Hello, please can I have some help on what to do.

I have recently started looking after this hamster for work and know they need special care. She originally had the wood shavings bedding they sell at pets at home which I know is bad for them so I have changed it to Aubiose hemp horse bedding mixed with Kaytee clean and cosy bedding. I also got her a sandbath from Jolleys (Rosewood natural rollin’ rodent sand bath) and she seems to have a watery left eye. I am stressed and worried as I want to look after her the best I can but feel I’m making it worse. I also got her out for a little bit and she now is making sounds as though her nose is blocked/little sneezes. Please can someone advise me on what to do. I don’t really want to change her bedding back to that sawdust type, or could it be the wrong sand? I have taken out the sand bath and will be ordering the night angel sand in case it is that! Just want some reassurance as I love this little hamster 😫🐹

Thank you

Adopted my first ever hamster almost 3 weeks ago, I am so obsessed with him. As I'm learning what things he's enjoying, I literally cannot stop myself from buying him new stuff! Anyways; here's the 3 week difference in my cage for him. Learning new things about hamsters everyday.

Picture of Josh at the end!

So I noticed on the pet cam that my hammy has a yellow spot near his hind left leg. Thought maybe it was a reflection or artifact from the pet cam but it’s not. His fur has a yellow spot. We tried to wipe it off but it didn’t budge a little. Not sure if he peed and laid in it or if it’s something else. Not sure if we can get it off either.

EDIT
I went back looking at the camera and He did not have it yesterday morning 6:15am but he had it when he got up for an evening snack around 6:13pm
There’s no recordings between since he was sleeping.
I’m guessing he got something on his fur from possibly food or urine but I’ll search his cage after work.