Ron is correct on the chart here -- for Float, they always assume it's a Red exchange, so for a 1BR they will pull 9000 credits -- if its within 60 days, it will be a Flex and they will pull 4000 credits.
Some people will space bank credits into II -- I have a 1BR Blue deposit with II that cost me 5,000 credits (see Ron's chart).
But for a float trade (outside of Flex), they take either 8K/9K/10K for a Studio/1BR/2BR trade.
Good luck!
Greg