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:.DFH Indian Brown Clone
Primary:.Nostromo Full Thruster Simcoe Pale (10g)
Primary:.Clayburn Cream Ale (10g)