Saturday morning, my fish/TV room was 35 degrees!
It is a one room raised addition, and we have removed all the old crappy insulation and the ceiling, to get spray foam done on Monday. The construction of this addition was really poor. You can see daylight along the edges and corners. You could actually feel the wind.
Fish tank got down to 75ish. Thankfully it an acrylic 100 gallon and that has much better insulative properties than glass. Sump is in the basement too......I'm sure that helped.