After some serious blackhat link building (comment spam), one of my new sites is finally ranking on page 1 for a number of competitive keywords, and starting to rake in some $. This is due to sheer force of backlinks built over 3 months (approx 500 ******** links + anchor text per sub page). It's a privately hosted blog with affiliate posts on coupons & savings. I know that at around this stage, there is a high risk of being sent back down to google hell, or the sandbox as it is sometimes called. I would be grateful if anyone can provide their opinion on how to try and prevent this from happening.