Personally I wouldn't recommend keeping Port Jackson's & Bamboo sharks in the same tank/pond.
Since Port Jackson's tend to be Cool temperate water species (below 72F), while Bamboos are sub-tropical to tropical species (over 72 F).
It's better to get two seperate ponds for the Port jackson's & bamboo sharks. For the Bamboo make it a shallow "tidal pool" tank with the water temp about 77 - 82F. However the Port Jackson's needs a deeper tank/pond with water temps in the 65 to 70F.
Since Port Jackson's tend to be Cool temperate water species (below 72F), while Bamboos are sub-tropical to tropical species (over 72 F).
It's better to get two seperate ponds for the Port jackson's & bamboo sharks. For the Bamboo make it a shallow "tidal pool" tank with the water temp about 77 - 82F. However the Port Jackson's needs a deeper tank/pond with water temps in the 65 to 70F.