FNZAS (Federation of New Zealand Aquatic Societies)
Is the umbrella organisation of all the fish clubs in New Zealand
Auckland Fishkeepers is a member of the FNZAS
South Auckland do have a club but there are approximately 4 members in that club and they meet once a year around dinner.
Auckland Fishkeepers would be your closest active club Burgo.
Since Rockerpeller lives out your way, you guys could car pool to the club meetings, which are located in Green Bay.
When you join up with a fish club you get copies of the fabulous Aquarium World Magazine which is put together by the ever so kind Caryl.
You will have access to the clubs fish books and magazines, Enter the breeding scheme and possibly win a trophy
And best of all get to meet like minded fishy people.
One last thing. I believe Auckland fishkeepers has the lowest membership fees in Auckland