Two of my tetras are swimming in a jerky motion with their head pointed up. It’s very slowly getting worse over the last month. No other symptoms yet that I can see but I recently had one that started like this and then his spine started to bend. I eventually put him down. I’ve treated with Tri Sulpha tablets for about 2 weeks (includes sulfadiazine), aquarium salt (as 1tbsp to 5 gallons) just added a week ago, melafix (cajeput oil), pimafix(bay oil), and stress coat plus weekly. Nothing seems to be making it better. What could this be and how should I treat it?
pH 7.2
Nitrates 10
Hardness 150
Nitrite 0
Ammonia 0
KH/Buffer 120
Water Temperature 77 f / 25 C
Tank is 120L, established, live plants, gravel substrate.
I have Neon tetras, Candy cane tetras, pristella tetras, albino Corydoras, bristlenose pleco.
