Hello everyone, new to these boards and new to brewing. I began home brewing a few months back and have been enjoying the fruits of my labor for a bit now. However, this past batch (brewed this past Sunday (03/13)) has been fermenting quite differently than any previous batch. For some insight, the beer we did was a black session IPA (triangulation from all involved, 2 wanted a double ipa, another wanted a porter/ stout/ black ipa, and I wanted a session ipa - therefore, black session ipa seemed to fit the bill.) I'm doing partial mash still. This is the recipe: 6 Gallons of Poland Spring Water 1 lb Cara-Pils/ Dextrine 1 lb Pale Chocolate Malt 8 oz Carafa II 2 oz Fuggles (First Wort) 1 lb Dark Dry Extract 6.6 lb Amber Liquid Extract 1 oz Challenger 8.9% AA @ 60 min 1 Whirlfloc Tablet @ 15 min 1 oz Citra 12.8% AA @ 10 min 2 pkg 100 million cell California Ale White Labs WLP001 4 oz Citra 12.8% AA Dry Hop @ 7 days. Practically, immediately I noticed the burps on the airlock faster than normal, and over night the airlock gunked up with beer. I sanitized another airlock/ plug, threw out that airlock/ plug and replaced it. Again, the next day, the airlock/ plug were gunked up and heavy yeasty/ cocoa powder aroma were present. I prepared a dish of Starsan and quickly removed, cleaned, and replaced the airlock/ plug. I currently don't have a setup for a blow-off tube and realize this is probably the solution. So, I guess the questions I have are these: Why would such a vigorous fermentation occur on a 5.8% (I know this is higher than session) Black Session IPA? Is the yeasty smell an indicator that I may have pitched too much? I usually brew with 5 gallons of water, but decided on this batch to do 6 to try to increase the yield - was this the error or reason for such a vigorous, eruptive fermentation? With all the beer gunking up in the airlock/ overflowing onto the carboy, is there a worry for contamination? Did I appropriately (with limited resources, i.e., no blow-off setup) address the problem? And then any recommendations for making a blow-off setup, as I am going to set one up asap at this point. Thank you for any and all consideration/ response.