Oh, only 3 hours, not surprising it hadn't fully attached, but glad it has now. The other parameters look good and it's good you're getting the nitrates down. During the acclimation period, I wouldn't want any nitrates, but I can tell you from experience, H. magnificas that are well established can tolerate fairly high nitrates, at least for brief periods. What measures are you taking to lower the nitrates? Do you have a good protein skimmer? I think a good ps is very helpful at keeping the overall water quality up.