Ive had 4 tetras become skinny and dull in color even though they are eating and then die. The first neon in the video is the same age as the second one I showed, they looked the same when I got them they were both pretty small but only one of them is getting bigger. They both eat a lot it's not like the little one is getting pushed away or not eating I watch them eat. Is it parasites? also I know they have ich but this started before ich was introduced to my tank it's unrelated. The tetra next to the fat healthy colorful one is starting to dull too and lose weight
Posted by Acceptable_Pilot_749
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Look up Neon Tetra Disease. I’m thinking mine have it too. It’s a parasite, if my research is accurate you need to quarantine all fish showing signs of it. Again, that is of my research is accurate. I’m not holding too much hope for my school.