You have an upside down catfish and neon tetra in your tank Other fish you put their fins eaten or are dead partially the morning who is aggresor?

The most likely aggressor in this situation is the upside-down catfish. Upside-down catfish are known to be territorial and aggressive towards other fish, especially those with long fins. They may nip at the fins of other fish, causing damage and stress. In some cases, upside-down catfish may even kill other fish.

Neon tetras are peaceful fish that are not known to be aggressive. They are more likely to be victims of aggression from other fish, rather than being the aggressors themselves.

If you have an upside-down catfish in your tank, it is important to keep an eye on the other fish to make sure they are not being bullied or injured. You may need to remove the upside-down catfish from the tank if it is causing too much trouble.