[cypher]

If they start biting when you put something new in the cage it can be because they really like it & get a bit territorial over it but it can also be when they don't like something, I'd give him a while to get used to having it & if doesn't improve maybe just try the old wheel again to see if that makes a difference.
If he was drinking too much you would really notice it, apart from checking water levels with something like diabetes or kidney problems they drink really frequently so he's probably just a bit thirsty.