Brewed a brewer best dble IPA a little over week ago. Got it in the fermenter at 70 and bubbling every 30 sec or so. Been 9 days! I'm noticing the krausen has totally gone down and there is little islands of bubbles and dried looking stuff. Might be hops or yeast left over on top??? Not sure. I'm concerned it might be infection. Oh boy!! Can't bottle this weekend. It will be in for over two weeks by then. OG was 1.074. Haven't taken a gravity reading since. Should i leave on yeast cake? had 6 oz of hops added at boil. Any tips? Thanks.