Quote:
Originally Posted by Stitchawl
New tank, well cleaned and rinsed before use. Rather small shelf top tank, 12 liter, new washed gravel and plants from a very healthy tank. Water was aged for several days before adding fish. All chemical test results normal.
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12 liter!? About 15cm by 20cm by 40cm (or similar?) That's a small tank. I'd suspect too many fish at once as the root cause.
The tests might have been normal before the fish were added, but did you test a few days after the fish were added, or when they started dying?