I haven't seen this issue posted on the forums so I'm not really sure if anyone has had this happen to them before. I brewed a big beer about 9 days ago and pitched a 1.5L starter (before decanting) that was on a stir plate for about 24 hours. In this starter was 2 vials of White Labs WLP001 yeast. The OG at the time of pitching the yeast was 1.072. The very next day after pitching the yeast, I get a SUPER aggressive fermentation. I fitted my conical with a blow off tube because I figured this would be the case. Fermentation continued to be aggressive for the next couple days and then really started to slow down to about 1 bubble every 35-40 seconds. I noticed the conical was fairly cold to the touch so I was afraid that the wort may have become too cold for the yeast to do their job properly. I put my hands on the conical, and just the warmth from my hands had the fermentation back up to bubbling at about a bubble every 10 seconds. I moved the conical into another room and put a space heater in there with it. It quickly went from averaging 35-40 seconds between bubbles to 3 seconds between bubbles, but only while the spacer heater is on. As soon as the heater kicks off, it immediately starts fermenting slowly again. Every time the heater is on though, the fermentation almost IMMEDIATELY picks back up to a bubble about every 3 seconds, and just as quickly as it sped up, when it turns off, it slows down. I should also mention that this is an extract recipe and only my second batch ever. Oh, also, ambient temp of the house is roughly 72. So, all that being said, should I leave the space heater in there or take it out and let the yeast slowly do it's thing? Thanks for the replies in advance guys!