If you want pretty setups and indoors I suggest you look at other fish. Guppies can be rewarding, corys are great fun; and if you have enough patience to wait for them to grow up fancy plecs and discus could be an option.
Orrrr you could just focus on display tanks, especially because you live in Whangarei and unless you go to Auckland often you will have to ship all your fry. Thus it will be difficult to flog your wares as it were.