I neglected to mention in the video that my conclusions about seed blocks really apply to farms of roughly this size – 8×8 or 16×16. As a farm gets larger, the area increases in relation to the circumference and at some point, the speed of freezing will clearly benefit not having to wait for the edges to freeze in to the center, and the loss of ice blocks will more than make up for itself. I’m still trying to figure out how large a farm would have for this, but it’s far bigger than I have room to build on the Modified Taiga Island on the Minecraft LAN Party! server.