If they stick close to the comics, then the zombie aquariums are just the tip of the iceberg in terms of how twisted the Governor is. There's one particularly gross/disturbing plot point that I thought the TV show might choose to drop, but (without getting into spoilers) I think there was some foreshadowing in the last episode that suggests they might actually go there. Looks like this season is going to really ratchet up the creepiness!