Glass tanks really aren't large enough or healthy for rats to live in. They should be in a large, well ventilated cage. Especially a rat Winkie's size.

It'll do for now, but I'd save up some money and get a large cage for him if possible. I'd post an ad on Craigslist asking if anyone has a ferret cage or large rodent cage for cheap.

I *think* you're in CT, but I found this ad on Craigslist. Pretty good deal for a Ferret cage!
http://newlondon.craigslist.org/pet/458424830.html