Martyr of Charity, at 3-1, won Sunday's seventh race to start the Rainbow 6 at Gulfstream Park.
The carryover coming in was $360,902. Bettors added $197,523 to the pool.
Gulfstream has guaranteed that the pool will be at least $600,000 if there is just one ticket with all six winning horses in the Rainbow 6.
In that situation, Gulfstream will have to put in about $40,000.