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Old 07-03-2014, 07:21 PM   #1
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My Julii Cory Cats are fighting all the time.

I had 4 lovely Julii (false Julii I think) Cory Cats in my 60l gravel bottomed tank for about a year and they were great. Very lively and entertaining but all friendly! One died and the 3 remaining ones became a bit more subdued. I recently bought a 125l tank and put nice sand in it specially for the Corys. I bought 3 more False Julii Corys which looked identicle, however when I got them home the new ones were slightly bigger than my existing ones but exactly the same marking pattern and shape. The 2 groups were bought from different LFS' s.
After allowing the 3 new corys to settle in I transfered my origional 3 to the new big tank. Almost immediately fighting broke out and it has been going on for 2 months. Often 2 fish will seem to pick on another, sometimes two seem to be getting alonf nicely then a 3rd or even another pair come slong and they all start barging and chasing. Sometimes one fish (hard to tell if it is alwsys the same on) gets trapped into a gap or corner by the others, when they eventually let it go, usually because I startle them by sproaching the tank, the fish lpoks stunned and just sits for a while. I have tried to video the behaviour but it is not the most aggressive example and I had to do it from a distance on zoom so it is very bad quality but here it is...
http://youtu.be/YKzEnsO2kII
Should I be worried or even try to seperate my origional 3 back to the old tank? They seem to have equalised in size a bit now and its hard to seperate them now but I could probably tell.
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Old 07-03-2014, 10:02 PM   #2
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I have no clue what is happening except maybe a dominance issue. It also depends on the male/female ratio.

I have always housed multiple species of corys in 1 tank and never had a problem, but I have always had 1 male to 5 female ratio...I like to help my males out by letting them think they are stud muffins.
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Old 07-03-2014, 10:03 PM   #3
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I forgot to say, I tried to watch your video but it is set to private.
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Old 07-04-2014, 04:25 AM   #4
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Could be breeding behavior ? Lots of chasing.

Here is one pair http://youtu.be/FYzKJ-Me044

And more
http://youtu.be/hrK9xpWgR5g


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