nope - just toss it on top and let er rip! I often pour a new batch on an existing yeast cake even when its not the same beer (as long as its not an extreme difference)
8-Paws Brewing Co.
Tap 1:.Fightin' Words Irish Red
Primary:.Two Hearted Clone (10g)
Primary:.Mudpuddle Stout (10g)
Primary:.Arrogant Bastard Clone (10g)