I have a 10g in my house that has a twin-tube shop light sitting on top of it. My problem is that I want green water, but seem to be only getting spirogyra. I've been adding Miracle-Gro and running the lights 7x24, but so far, no real progress. Any ideas? David W. Webb Texas Instruments (972) 575-3443 (voice) http://www.dallas.net/~dwebb (214) 581-2380 (pager) 2145812380 at alphapage_airtouch.com