The only reason I picked Fish was because that is the only Legacy deck I know inside and out because it is the only one I can afford to build (LOLZ), but even in a room packed with ZOO, you can still win with it with the right SB.

The black splash was awesome! Perish and Nature's ruin are so good against ZOO! I usually splash white for swords, but I like the black splash better! You could also run extirpate to, but I don't think its needed.

The only deck I really fear is counter balance because if you don't have vial, then you pretty much lose to that combo.