Congo Tetras becoming aggressive - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 5 Old 06-21-2012, 11:08 AM Thread Starter
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Congo Tetras becoming aggressive

My older Congo Tetras are seemingly becoming aggressive towards the younger Congos and shoo off other fish, also theyve started to hunt down and chase the CRS which they have never done before.

They are usually so placid i dont get the change in temperment.

Is it something to do with breeding or another natural occurance?

Any information would be greatfully taken on board.

Altho this is disturbing shift in behaviour it is also quite comical after theyve just chased another inhabitant they immediately come to the front of the tank as tho there looking at me like a naughty child would

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post #2 of 5 Old 06-22-2012, 11:49 AM
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Probably normal behaviour, but if you could take a video and post it I could be more certain. This species is very active, mine hold relay races down the tank regularly.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 5 Old 07-04-2012, 02:30 PM
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Sometimes fish change temperment as they mature. Usually for no apparent reason. They just become grumpy towards the other fish. This has happened to me several times with different species. If you have enough tank space, you might try increasing the size of the group ti disperse aggression.
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post #4 of 5 Old 07-04-2012, 04:41 PM
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Originally Posted by dave56 View Post
Sometimes fish change temperment as they mature.

Congos are pretty aggressive (for tetras) - that sounds like normal behavior to me. Mine (fully grown) are only placid when they are sleeping. Also, their behavior changes throughout the day. There are times when they beat the crap out of each other, and times that they are all just milling around together.

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post #5 of 5 Old 07-06-2012, 07:57 PM
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How many do you have? When I lost a few black phantoms, the rest (4) became extremely aggressive towards each other and the other fish in my tank. They also began to direct the majority of their aggression toward one specific black phantom in the tank. Once I added more, their aggression spread out and calmed again. Tetra stress out if their in too small of a group.

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