Fish dying one by one, what's causing it?
I recently set up a 60-liter aquarium with goldfish. At first everything was fine, but after a week they started dying. I checked the water and the pH is normal. What am I doing wrong?
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The main thing is that goldfish produce a huge amount of waste, and 60 liters is too small even for a single fish, let alone several. They quickly foul the water with ammonia and nitrites, which don't show up in pH tests but kill fish within days. Try either keeping just one fish and setting up a powerful filter with activated charcoal, or move them to a larger tank - at least 200 liters for a pair. Also check if you have aeration and do regular water changes (20-30% per week).
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