Skip the Purple Up -- you'd just be wasting your money on an all-in-one gimic product when you should be testing for and dosing the individual components as needed (calcium, alkalinity, magnesium -- although magnesium is usually kept up with very easily just with water changes). The individual products are also cheaper to use over time.
Seven weeks is not a long time, considering your initial cycle probably took up around 2 weeks of it. If you want to speed things up a little, find an established tank that has coralline algae on the glass and ask for some scrapings. Collect the scrapings in some water, then add the scrapings to your tank. To prevent them from getting separated out by any filtration system you have, you might want to add them to your tank via a turkey baster or needleless syringe instead of just pouring them into your tank. You can also use the baster / syringe to apply the scrapings (which will be a fine powder) to individual rocks. It sounds like a hassle, but really isn't. Another alternative is to borrow a small coralline covered rock from a fellow reefkeeper. Either way, it'll still be weeks before anything is noticable.
Don't worry, soon enough you'll be complaining about needing to scrape it off the front of your tank every few days.
