I would have five livestock categories.
1) as above, extremely rigorously treated and QTd fish. I would charge 1.3x market rate for them to accommodate this expense. Most serious reefers I know would be very happy to pay for this.
2) cleanup crew that is brought in as a large batch and given fallow condition QT, to be completely free of fish parasites.
3) a giant vat of dry rock that has been cultivated for about a year with real pest free live rock. This might require a few vats to make it work.
4) I would specialize in corals from local reefers importing nothing from the wild. I would make sure that every local reefer knew that I would pay a fair price for frags or corals, and that I should be the place they bring anything they have too much of. I would sell these corals at below market price. I would want everyone in the area to know that my corals are 20% less than my competition. The margins on wholesale/retail coral are sky high and by buying local you would eliminate shipping related loss. I would have coral flats that are quarantined in batches.
5) I would supplement my local reefer frags with corals from ora and tidal gardens, where I believe the corals are legitimately aquacultured (not chop shopped) and legitimately pest free. These would be kept separately from the local reefer corals for biosecurity.