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Results 1 to 4 of 4
  1. #1

    Default aggressive neons???

    0 Not allowed!
    I have kept neons and cardinal tetras before and have had no trouble with aggression. I have them in a planted tank which I have never done before... What kind of conditions would drive a community fish to be so mean to each other?

    I have a high PH
    I did keep the tank at 25 degrees but have lowered it to 23 degrees in an attempt to "cool them down"


    Currently 5 neons/cardinals
    Just added 3 cory cats today and no change in behaviour. Corys have been harassing the neons a bit but not badly.
    29g - planted ; 5 cardinal tetras ; 3 cory cats

  2. #2

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    0 Not allowed!
    The tank is big enough for them so I don't think it is territorial aggression. You might need to get more to create a larger group. Most fish, even those which are considered extremely peaceful like neon tetra, will find a "pecking order". A larger group of this schooling fish should help to ease the aggression.
    When I go fishing I just throw sharp rocks in the water and wait for the dead fish to float to the top... Kingfisher
    Everything happens for a reason. Sometimes that reason is you are stupid and make bad decisions.

    I think my fish is adjusting well to the four gallon, He's laying on his side attempting to go to sleep on the bottom of the gravel.
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  3. #3


    1 Not allowed!
    I see a few reasons why they might be showing aggression. First, we are talking Celsius right? I'm gonna go ahead and assume so and carry on. Second, IME cardinals prefer a lower PH. Thats also the answer I got when when researching before I got my cardinals. Third, I don't think cardinals and neons school together. I may be wrong, but if not, you should bump both separate schools of fish up to 8-10. As long as your tank is big enough for more fish. Corys also would be happier with a bigger school. At least a school of 5 Corys would improve their behavior greatly.

  4. #4


    0 Not allowed!
    Quote Originally Posted by Shadowisper View Post

    Currently 5 neons/cardinals
    Just added 3 cory cats today and no change in behaviour. Corys have been harassing the neons a bit but not badly.
    Is this a bare tank?
    You're keeping 2 shoaling species in insufficient numbers.
    25c is very high for a lot of cories, 23 is fine for neons

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