6 Rummy nose tetra, 7 galaxy rasbora, 1 betta male and 3 shrimp. (60 litres - perfect water quality all tested litterally 5 minutes ago, 26 degrees)
10% Water change was done 3 days ago and a teaspoon of aquarium salt added.
ammonia - 0, nitrite - 0, nitrate 10-20ppm, ph 7.2
Most of the fish...