I made the move from a 55 to 90. Set your new tank up as soon as possible to get it cycling. Let it do its thing for a few days. Slowly start adding your rock to the tank. After tank is cycled move your livestock over and tear the old one down. Go with halide lighting, more expensive then t5 but youll be happier with the results. Also pick up a bottle of stability from aquatek itll help get your tank cycled a lot sooner, and its great when adding new fish to the tank too.