when I took my first reading before pitching yeast it was around 1.090. I know that is way too high. All I can think of is that when I topped it up I didn't mix it well enough and got a bit of the concentrated wort. It was supposed to start at 1.045. Or maybe because when I topped it up to what I thought was five gallons it was actually 4.5. The other half gallon actually just turned out to be foam. Would that have made the OG higher? I am guessing yes, but not that much higher. And if that reading was correct, could that be part of the reason the fermentation is so slow and weak? Can I pitch more yeast after it has already sat for a week? Would I need to do that if the gravity is still high?