Steadily (5), at 6-1, won Gulfstream's fifth race, starting off the Sunday Rainbow 6.
The carryover coming in was $305,346. Bettors added $291,723 on the Rainbow 6.
That made the pool almost $600,000 prior to the 20 percent takeout of today's bet.
Gulfstream had guaranteed that today's pre-takeout pool would be at least $500,000, pre-takeout, if there is just one ticket with all six winning horses.