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It could be a disease. Note where the lumps are and what they look like. Are there any sores? white spots? What does it's eyes look like? Are the fish acting peculiar? Observe the fish for a short while and notice what it looks like and what it is doing. You can go to where you bought your fish and they should be able to give you an idea or even tell you what might be wrong.

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Q: What does it mean if neon tetras have lumps underneath them?
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Related questions

Do neon tetras have long tails?

No, neon tetras have very short tails.


Do neon tetras and catfish live together well?

Yes,Neon tetras and catfish live together well.


When do tetras separate?

Neon Tetras do very well in soft and slightly acidic water. If there are a couple of Neon Tetras left, it may be best to quarantine them in a separate tank.


Can platys eat neon tetras?

No.


What temperature do neon tetras live at?

neon tetras live at standard tropical aquarium temperatures, but a good place to start is about 76 degrees Fahrenheit


Do neon tetras actually have neon in them?

Neon light bulbs work by transmitting electricity through neon gas to produce light. Neon tetras are not electric, so neon is not the culprit of the fishes shimmer. The colors that you see on a neon tetra are a result of iridescence.


Will neon tetras die if they don't get darkness?

if you mean colouration then no if they don't have a lot of colouration it means there stressed


What fish can you keep with angelfish and neon tetra?

angel fish can eat neon tetras is the simple answer, but i have angel fish and neon tetras in the same tank and the angel fish does not bother the neons, although this may be because the angel fish is not full grown yet so it is a 50% chance


What part of the ocean do neon tetras live in?

Neon tetras live in fresh water, not salt. So they probably live in areas of the Amazon River.


Can neon tetras live in salt water?

No, neon tetras are freshwater fish and cannot thrive in saltwater. They require specific water conditions and saltwater would be harmful to their health. It is important to provide neon tetras with the proper environment to ensure their well-being.


What colors are neon tetras?

The Neon Tetras are neon blue with a narrow pinkish or red stripe running across their sides. Very pretty fish and very hardy. Great for starting a new tank with.


Can neon tetras mate?

Neon Tetras can not get pregnant. They are egg layers and EXTREMELY difficult to breed.