Test before 50% wc:
Ammonia: ? (I cant test for it)
Nitrate: 30 ppm
Nitrite: 0 ppm
When feeding my 29g, i noticed that one pf my black skirt tetras had popeye in one eye. Its fins were also torn, and there were black spots on his scales. Its still eating also.
I just did a 50% water change...