I bought a light DME from my LHBS twice and both times, I got a stuck fermentation. This time it stopped at 1.03. I brewed another one with wheat extract and it fermented fine.
Is it possible that the extract is bad or non fermentable? I aerated this one good(OG at 1.045), pitched Wyeast 1056 without a starter, but with a well-swelled smack pack. After it stopped, I pitched another Cooper's dry yeast 2 days ago to get it going and it has done nothing since then. Still at 1.03. It's been at a steady 68F since I started. The yeast is good, and the aeration should be okay, could it be the extract?