My Neon Tetras are fighting

rkeehn547

Hello, I noticed today that my neon tetras started fighting out of nowhere. In the tank I keep 8 neon tetras, 5 harlequin rasboras, 4 Cory catfish, a molly, and a platy. None of the other fish are fighting besides the neon tetras. My water parameters are normal, 0ppm ammonia, 0ppm nitrite, ~30ppm nitrate. The ph stays at around 7.8-8.0. The tank is fully cycled and I’ve had the fish for around 10 months now. I can’t think of anything that would be causing the tetra to fight. Is there anything I could do about it? Thanks
 

MacZ

Tetras bicker. Absolutely normal for these little piranha. How big is the tank? Some structure, like twigs and branches might be helpful.

Nitrate is a bit hight (up the waterchanges) pH is as well for most of your fish, but you can't go down because of the livebearers.
 
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A201

The Neons fighting is a good thing. It indicates healthy robust fish. As long as the fighting isn't causing injury, no worries.
Chances are the sudden aggression is mating behavior.
 
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MacZ

Chances are the sudden aggression is mating behavior.
Not in these parameters. Not neon tetras. They might not need it as low as cardinals, but it's highly unlikely with a pH of 8.
 
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A201

That's true. I didn't consider the elevated PH.
 
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rkeehn547

Tetras bicker. Absolutely normal for these little piranha. How big is the tank? Some structure, like twigs and branches might be helpful.

Nitrate is a bit hight (up the waterchanges) pH is as well for most of your fish, but you can't go down because of the livebearers.
The tank is a 20 gallon tall. My tank produces about 20ppm nitrate per week. What should I try to get the nitrate down to when I do my water changes?
 
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MacZ

What should I try to get the nitrate down to when I do my water changes?
10-20mg/l are a good level, rather towards 10.
 
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Redshark1

You know the phrase "cool it".

When my Neons were fighting I lowered the temp gradually over a week from 78 to 72F and they fought no more. I've heard that this is a common temperature they are found at in the wild, though the wild temperature fluctuates.
 
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