I just got some frags from a fellow reefer, and nitrates are just around 8-10 ppm. I will have them alot lower by the end of the week but will the frags do ok? I tested his water and can't detect any nitrates period.
you will be fine... it is actually beneficial to have some nitrates around 5 or so in the water so that the corals have something to feed on. My nitrates in my sps tank have been up as high as 20ppm before with no ill effects (just slower growth).