Thanks for the input guys, i used foil board for the back the door which is foam with insulation foil either side which i have cut and slipped into the panels like LithoMan and used the same foam to insulate the brick wall side of the garage which you can already notice the temp difference in the room. I'm kinda limited to the garage for the fish room which makes it hard but going to run with it, mainly because the other half doesn't use it. I'm interested in how you sealed the sides LithoMan sounds like you could still use the door. While looking on the net i have come across a similar thing but it uses brushes in aluminium strips.