The foam on top (aka Krausen) typically falls back into your brew - but this is not always the case.
The ONLY way to know if the fermentation is done is via hydrometer. Take a reading. Wait two days, take another reading. If they agree, fermentation is done.
- blogging about making my own beer and raising a lot of kids.
Check out the priming sugar calculator
and the beer calorie calculator
Fermenting: Oatmeal toffee stout
Bottled: Enchantress (big Irish red ale), Thundersmoke brown ale (Yorkshire brown), Belgian golden strong ale, imperial nut brown ale