Ole Larsen writes... >Has anybody here ever seen green water in a tank with a pH of 6-6,5. I have n-e-v-e-r-, but I would like to know >if somebody else have Yes, down to a little below 6. Water changes would bring it up again to 7.5 or so. The lower pH didn't seem to bother it for those few days. -- Dave Whittaker ac554 at FreeNet_Carleton.ca