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Here are a few more pictures of the tetra. I see the same stuff on at least two others, but to a lesser extent. They're still apparently all acting normally, eating greedily as ever, schooling, etc.
Hi!
I have a weird looking tetra. One of its front fins (the ones next to the gills) seems to be missing, and it has kind of a bulge on one side at the front.
I shot a video of it. Hopefully it's clear enough to draw a conclusion:
Temperature: 23°C(73.4°F) (lowered from 25°C(77°F)...