I have chaeto, and its growing well.....I am going to try something I have read.....the cost seems rather low so its worth a shot.....it basically said you can use a phosban reactor as a nitrate reactor, same principle, fill it up completely with Kent marine Nitrate sponge, or some other nitrate absorbing substrate, and turn it down till it drips one drop per second, over a period of three weeks or so, it will get colonized in the same fashion, then you can move up to two to 3 drips per second, which should equate to 40-50 gallons per week of zero nitrate water.......seems simple enough.....I am also going to be building a denitrifyer....just to see which works best.....should take the same time to cycle.