At 02:07 AM 8/27/1999 -0400, Roger S. Miller wrote: >My question about why the heck we need 0.5 mg/l of iron in our aquariums >still stands. I can't imagine keeping it that high. At anything over 0.2 mg/l I start growing thread algae all over. Since I am too lazy to get out the test tube brush and go "algae twirling", I stay at around 0.1 mg/l. Jon Wilson http://www.knology.net/~jwilson/plants.htm