It's off-gassing (existing CO2 is coming out of solution).
We need more details to help any further (recipe, procedures, etc).
11 lbs. Maris Otter Pale info
1 lbs. American Chocolate Malt info
1 lbs. Special Roast Malt WK info
1 lbs. Black Roasted Barley info
3.15 lbs. Liquid Dark Extract info
1 oz. Columbus (Pellets, 12.00 %AA) boiled 60 min. info
1 oz. Northern Brewer (Pellets, 8.00 %AA) boiled 30 min. info
.75 oz. Fuggle (Pellets, 4.75 %AA) boiled 1 min. info
2 ounces each- Amaretto, Chocolate Almond and Anise extract (not included in calculations)
2 ounces each- Irish Cream and Cognac extract (not included in calculations)
Yeast : White Labs WLP885 Zurich Lager Yeast
7 gallons boiled to final volume of 4.25 gallons
after 3 weeks, hydrometer reads 1.051
added lalvin ec-1118. after 2 weeks same gravity reading.
added 4 beano tablets 3 days ago, but same amount of airlock activity as before. what should i do? any way to get that gravity reading down?