I brewed my first batch this past Friday. I ended up with less volume than I planned, so I'm thinking it might be strong. Fermentation started fast and looked to be going strong, then this sludge started forming at the bottom. It used to be more now it has decreased. I'm thinking it's the malt extract. But is this normal? It seems like a lot. Maybe it won't be very strong after all. Any words if wisdom/advice for next time?