Foreign institutional investors (FIIs) were net sellers of Rs 31.99 crore (provisional) on Tuesday, according to data released by BSE. While FIIs made gross purchases of Rs 2,327.66 crore, gross sales totalled Rs 2,359.65 crore.Domestic institutional investors (DIIs) were net buyers of Rs 511.33 crore on Tuesday. While DIIs made gross purchases of Rs 1,250.15 crore, gross sales totalled Rs 738.82 crore.