Don't know what to tell you then. Looks like you're doing things correctly. If you want faster growth, you could turn up the heat. You could probably go as high as 85 or so without any problems. Just remember that warmer temps mean a greater possibility of mold or rot. Just watch it carefully. Keep PH at 5.5 or so. Have the light as close as possible. You could get it real close, like a couple inches, if you set a small fan on the res. lid and have it blow straight up at the light, or use a cool tube, or both.