Alot of that same equipment required depending on what inhabitants you want.
I kept a local marine tank of about 800 litres for over 10 years. You need a good skimmer, a good biological filtration system, good lighting depending again on what you wish to keep. Regular water changes are necessary. i keep mine in a air conditioned room to keep temp under 20 degrees in summer. A chiller would be better.
You will go through the same maturity issues that trop marine go through, algae and diatom cycles etc.
There are some great livestock available at local beaches. West coast beachs on certain days (very low tide , minimal swell) can yield awesome critters and fish. I collected baby sole, baby moki, baby maomao, big eye, scarlet wrasse, leaf fish, hiwi hiwi etc from muriwai at different times.