If you think about it oscars would be a great fish for this plan. Ops friend could go buy about 30 baby oscars from all over and grow them out and slowly seperate them and then you can sell the leftover oscars and start a breeding project with whatever pairs he can get and put them in either small ponds or a couple over filtered 75s. Then you can raise all the fry in a 100+ gallon barebottom and grow them to about 2" and sell them all for $10 a piece. Oscars are surprisingly expensive if you think about it and they are high in demand in the aquarium hobby.
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