I am running the meridians at 10.5 inches, the strips are at 8 inches.
For the other stuff, not saying that you should try and aim for what i do though, every tank is different. I have had really good luck running near sea level alk too, i stay at about 7.8 - 8 dKh. 5ppm no3, between .03 and .1 po4, 400ish ppm cal, 1250- 1350 ppm mag. I feed about every other week or so reef roids, benireef or af power food, just kinda cycle between them. I also dose ammonium and urea, about 7ml/day, sometimes more, sometimes i forget.