So I bought a baby guinea pig from petsmart ( dumb Ik) in hopes of giving him a better home. Long story short he was malnourished & sold to me sick and ended up dying in 10 days after I spent over $300 in vet care. Rip red. In those 10 days before fully noticing he was sick, I exposed my other guinea pig to him ( Jeffrey) who’s an adult... Jeffrey now has some weird things going on and I’m concerned. He was getting slight crust around his eyes about a week ago and was sneezing along with a runny nose which has now stopped... the last time I witnessed him sneezing he let out some clear snot and seemed fine after. The only thing that’s still seems weird is when he makes his rumblestrutting sound , it sounds muted Almost like internal congestion and tiny clicking noises like once a day. I was wondering since it seem to be clearing on its own should I just pump him with vitamin c lots of greens & good fluids for a few days to see if it continues, or can I possibly give him one of the two medicines I got when I was treating his late friend.