starter won't float
I created my first starter 12 days ago; I followed Gaaarp's instructions. For the last 6 days it's been sitting on my countertop (ca 67-69 during the day, ca 63 during the night) and I've religiously fed it 2x a day. It always doubles within the first 4-5 hours. It always smells nice and strong after it's doubled, and it's bubbly.
I tried the float test just now and the bit of starter sank like a rock. Do I simply need to give the starter another week or more until it's ready to be used in baking? Anything I'm doing wrong? I wanted to bake tomorrow, but I'm guessing that's off?