i tested all my ammonia, nitrate, and nitrite. ammonia is at 0ppm, nitrite is at 0ppm and nitrate is just under 4ppm. i put in two fish, a needle fish and a pepper cory catfish. about three days later my needle fish dies, he ate and everything.
i got a new needle fish and he dies too, but my catfish survives
i got a new needle fish and he dies too, but my catfish survives