T.I.B.E.T (The Incredibly Big Expensive Tank)

Last night my other half, Kevin, and I are hanging out in our basement/demo central. We were trying to make a shopping list for the hardware store so that we can finish the fishroom after the delivery of our water change tank. So our shopping list starts piling up and Kevin turns to me and says "where do you want the hole for the fan exhaust?"

Way back when we had a discussion about removing the window, and bulding a vent box to sit in the frame. I thought we were still ...