well the tank and all the fiberglass work on it and in it is free due to good business dealings, and the acrylic window is almost free due to good business dealings. But then there are the many pumps, fittings(3"-4" PVC fittings are silly expensive), ballasts, bulbs, (trying to work on an led lighting setup to reduce electrical running costs), huge skimmer, huge calcium reactor, ozone generator, water quality moniters and controllers, timers, 90x30lb bags of aragonite, 25x200g buckets of salt just to get it full, backup generator cuz you dont want to know how much the rock and livestock will be worth, ventilation, chiller/heat exchanger, and many other things... yeah it will take some time but it is comming along
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