is it the krausen?
if it is, get a blow off asap.
if it's just the starsan or whatever you have in there foaming from the C02, thats normal.
RAINYDAY BREWING AND WINERY Sherwood, OR - EST 2010
Coming up Whiskey Oak Aged Imperial Rye Stout
Primary Sour saison - Lambic inspired coolshipped + dreg beer - Nut Brown
Kegged Nelson, Kohatu, Citra IPA
240v - 4500w electric two tier