> However, there is a persistent problem with thread > algae (the green, spider web like, hairy stuff which > makes long, well, 'threads') and now I'm out of ideas > for fighting them. To keep the tank looking nicely, I > have to harvest them every other day or every third > day. Thread algae comes and goes in my tanks regularly. It is never a big problem because it is so easy to remove. Just keep pulling it out when you notice it. dan