I brewed an IPA on 6-8-14 and bottled after three weeks.Its been about 5 weeks in the bottles and there is not even one single bubble.Absolutely flat.It was a weird fermantation kind of like a lava lamp coming from the bottom of the carboy two weeks in.Fermented at 69 in temp controled freezer.Could something have killed the yeast? The only change in my routine was a s/s air stone,aquarium pump with hepa filter.Any advice would be great, but this one tasted like a dumper when I bottled it.