I brewed an AG Kőlsch on Sunday. I had made a 1.5 liter starter which I decanted and pitched around 5 pm. I've been maintaining 70 degrees. The next morning it was bubbling away, nothing crazy, but fairly consistent. Tuesday the bubbling slowed down to almost nothing. I've never experienced this slow down with any of my beers. I peeked into the keg and noticed a lot of nice Kräusen. Should I be concerned? Should I pitch more yeast? Or should I wait and take a gravity reading after 7ish days?