So over the past few days a few of the kuhli loaches that I recently bought have been dying. So I removed 1 today that seems to be struggling to swim and it looks like it has a kinked spine. What should I do with this loach and what should I do to prevent further death? Also The tank has ember tetras that are doing great.
Water Parameters:
pH: 7.5
Nitrates: 20+
Hardness: soft (no exact number)
Nitrite: 0
Ammonia: 0
KH/Buffer: unknown
Water Temperature: 28°C