At last check, Jim is at this point hoping to follow a schedule something along these lines : Freshwater tank, 3D background for saltwater tank, Creature-Pak 1 for saltwater, Butterfly habitat, 3d background for freshwater, Creature-Pak for freshwater, Creature-Pak 2 for saltwater, Terrarium, Aviary.
Disclaimer: Of course any of these things could be hindered or helped by numerous factors along the way and result in a somewhat rearranged game plan.