1-2" DAILY!? Holy smokes! Ours grows fast, and I guess I cant measure a daily amount as I'm not by the tank every day (silly little thing called college gets in the way). I do notice explosive growth when I go home every other weekend or so.
Not that my experiences are worth much but i've had decent growth of halimeda under halides and VHOs. Theres a few spots of it in our 150 which is lit by 2x 400W XM 10Ks, and as it grows, we prune it back and put it in the fuge which is lit by 2x 95W VHO White Actinics.