I am fermenting an alt in my cellar using WLP036 (Düsseldorf Alt). Pitched a 2 litre starter into 21 litre 1.051 wort. Fermentation was extremely vigorous at 16 C ambient temperature for 36 hours, then dropped fast. Ambient temperature has dropped somewhat, to 14 C.
White Labs list the optimum range as 65-69 F (18-21 C), but it is supposedly common knowledge that the best fermentation temperature is cooler.
My question: should I move the fermentor to a warmer place, or is it fine where it is?