Robo Food Hoarding Concerns

[Rhea101]

Hi all!

I have some questions regarding my male Robo Donut who we got 2 weeks ago.

We have been giving him a spoonful of seed mix a day. He started hiding about 60% of it under his bedding, which is fine. It's been like a week and a half and I think the food is still sitting there, how can I know when it will go bad and will be unsafe for him to eat (it's a seed mix)?

I am also not sure how to clean out his bedding since he had little food hoards everywhere. He is in a ~400 sq inch (13inx30) aquarium and it's starting to smell a bit, so I wanted to clean all the bedding out, but I don't want to freak him out by taking away the food stock piles.

Lastly, we recently introduced him to a new seed mix because the last one didn't have enough variety. He hasn't been eating the new mix and is instead eating whatever he hoarded of the last one. Should I just keep trying to feed him the new one?

He looks like he's getting kind of chubbier than usual too.

I would appreciate any advice, thanks!