Hi, everyone, first if all thank you for your help!
Ben Ellison, I haven’t add any new fish since June. Everything looked great all this time. I fixed the temperature and turned off CO2, Charles Harrison, the who I consulted with suggested the CO2 could drop the pH And harm fish. The pH is 6.6 right now which is within normal range I guess. The problem is that most if the fish don’t really show any signs of the disease, except they don’t eat. The two rainbows looked perfect, they just stopped eating and died.
And I don’t really see any poop at all! I saw some white fluffy stuff coming out if rainbow, but read online that it is not a parasite or worm, it is mucus because the fish wasn’t eating.
I tried to capture the tetra who shows some signs as best as I could. It’s color is pale, the eyes are swollen and there is a white circle around the eye, pale spotting at the tale. It doesn’t look like ich to me. I treated ich a few times, and the fish was acting normal at the beginning, ut was just all covered with tine white spots.