Starship Aramis (8), at 6-1, won Friday's fourth race at Gulfstream to start the Rainbow 6.
The carryover coming in was $415,638. Bettors added $183,053 to the Rainbow 6.
Gulfstream has guaranteed that the jackpot pool for today's Rainbow 6 will be at least $650,000 if there is just one ticket with the winners of all six Rainbow 6 races.
Thus, Gulfstream will need to put in about $50,000 of its own money if there is a single ticket winner.
Gulfstream has gone nine straight days with multiple winning Rainbow 6 tickets--leading to the growth of the carryover.