First step was to construct the addition for my 40 gallon stand. This addition extended the length of the stand to 4' to match that of a 75 gallon tank.
I then tore down the 29 and 40 gallon tanks and move the plants and fish to a big rubbermaid tub.
The rubbermaid tub will bow out as you fill it up. To prevent this I built a 2x4 brace.
Next I attached the stand addition to the existing stand, places a new top on it and put molding around the top. I primed and painted the additions to match the existing stand.
Next step was to setup the hardscape, substrate and begin filling the new tank.