You need to maintain at least a 1.0, Laurie. I don't know how long it takes for a warning to be sent out if you remain below that minimum.
I was so worried about managing the ratio that I promptly donated some money to take the pressure off. Needn't have, as it turns out, because luckily the shows I've downloaded have turned out to be popular enough that I've already surpassed my seeding requirements--in just a week. But at least I have a nice cushion and don't have to worry at all, which makes me happy. Why don't you send 'em 20 euros so you can breathe easy?