I have been doing marine for just under 2 years have done 3 upgrades in this time still learning. If you live in Mt Roskill you must know about Hollywood fish farms in Frost Rd. and Jansens in Mt Eden Rd. I got every thing I needed at Hollywood last time around. My lights cost about 3 Thousand but that was for 2, see pics under 65 motor homers. I suggest you make a time to talk to Dave at Hollywood he is the owner and is not always there Im sure he will give you a price for a set up. Also come for a drive to Port Waikato and see my tank and set up and some of the others that will give you some idea. My tank is at 25D and I sure do need my chiller even at this time of year more in summer dont ask what the power bill is. But word of warning you cant neglect a marine tank you have to be dedicated, But I absolutely think its worth it.