Darren J. Hanson" <> wrote: <<<<<Ramirezi died (...) My suggestion before putting anymore fish in that tank, is to take all the fish out, bag them or whatever, and then strip down your tank. A good thing to use on cleaning it is vinegar. Rinse the tank and then set it back up. Place your fish back in it. Don't use the peat you had added to the tank previously. Check your fish for a few hours to see how they act. This way you will know it isn't your tank. Also soak all the tank gravel, decorations, filters, etc. in the vinegar. The best way to find out what happened is using the process of elimination.>>>>>> This would be a safe approach, although I am not sure about the real disinfecting potential of vinegar (I like it too, but as a mild cleaner). Another possibility, quite safe and maybe involving less work, is to leave the tank free of fish for a few weeks (say, 2-3), increasing the temperature as much as possible (say, 85 or even a little more). This will disrupt the life cycle of any parasites that might be present, and actually eliminate a lot of possible pathogens. Maybe I missed it, but I still do not know the ammonia and nitrite levels present in that tank, and a non-infective cause is still quite possible to be the one. The way I see it, work-intensive sterilization procedures are best indicated after water quality problems have been ruled out. But, to some extent, it's a personal choice, and others may feel differently! Dionigi