i, like many of the above, would have many tanks. i would have one, the biggist one 6 people could carry, full of different schools of tetras. one, again the largest, with some kind of chiclid (i really like oscars). then i would probably start breeding all the livebearers again, see what interesting colors/shapes i can get. then i would have a really big marine setup, with the strange looking fish in it. all the tanks would be planted heavily, with caves and the like.