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This is a discussion on fish harasment within the Freshwater and Tropical Fish forums, part of the Freshwater Fish and Aquariums category; --> You didn't say which species of danio, but all of them are shoaling fish, meaning they need a group. While six is usually considered ...

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Old 01-11-2011, 07:41 PM   #11
 
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You didn't say which species of danio, but all of them are shoaling fish, meaning they need a group. While six is usually considered minimum number, more is better.

Shoaling fish occur in large numbers in their habitat. This affords protection, but also they frequently (depending upon species) have a social structure within the groups. A recent (and the first) scientific study has proven that when shoaling fish are kept in smaller groups, less than 5-6, they frequently become more aggressive. Smaller tanks also cause this. Part of the reason is stress; not having the fish they expect around them and having too little space is stressful, and this leads to aggression (even in otherwise peaceful species) and a weakened immune system. I suspect this is a circle in effect.

If you check the species in our profiles section [second tab from the left in the blue bar at the top] there is info on minimum tank sizes [for only the fish species, additional fish in the tank may require more space], minimum numbers where applicable, and suitable companions. Also water parameters including temperature are given, and as someone mentioned earlier, fish kep at inappropriate temperatures can also be stressed and...here we go again.

And corys are shoaling fish, and should never be less than 3 in an aquarium, preferably 5.

Byron.
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Old 01-11-2011, 09:57 PM   #12
 
i seem to enjoy the smaller tropicals simply because of how hey school together and make shoals. but yes down the road i might consider trying my luck with the cichilds. they are pretty
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Old 01-11-2011, 09:58 PM   #13
 
yes. i enjoy large quatiies of fish rather than larger ones but i can see your rasoning
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Old 01-11-2011, 10:00 PM   #14
 
cories shoal? mine sems like he enjoys to be a loner
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Old 01-12-2011, 01:06 PM   #15
 
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Originally Posted by 123qweasdzxc1234 View Post
cories shoal? mine sems like he enjoys to be a loner
In the wild, all species of Corydoras live in shoals of hundreds of fish. Sometimes two or more species will be together, but they remain within their respective species. On his own, a cory is highly stressed; looks are deceptive, after all, on his own, he has no choice, but inside he knows he is in a very un-natural situation, and that causes stress. Corys are highly social, varying somewhat from species to species, but this is part of their instinct and must be provided for.

Here's a link to a video of corys in the Amazon that will illustrate what I'm saying.
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Old 01-12-2011, 02:57 PM   #16
 
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Great video Byron. I don't think people realize how corys shoal until they see a good size group and watch them move almost as if they are one unit.
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Old 01-12-2011, 03:42 PM   #17
 
holy cow. i didnt realize that! the guy at petsmart didnt mention that! wil he be fine another week on his own? and i hav added a dwarf gourami and 6 platies:D
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Old 01-12-2011, 07:10 PM   #18
 
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holy cow. i didnt realize that! the guy at petsmart didnt mention that! wil he be fine another week on his own? and i hav added a dwarf gourami and 6 platies:D
He won't kick the bucket overnight, or in a few weeks, but he is, to use the best word I can think of, somewhat unhappy--and that means stressed. And we want to better that. Next time you're in the fish store, get 2 more; as I mentioned, three seems to work. I have several cory species in my 90g and 115g, and it is interesting how some species almost never leave eath other, and others will. But they like to have their own near them. My panda corys are always together, and do they ever interact--nudging and tickling each other with their sensitive barbels constantly as they swim around.
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Old 01-12-2011, 07:15 PM   #19
 
yeah he does seem stressed. he is swimmin all over the tank and runninng into all he other tankmates. im planning on going to he petshop this weekend to get 2 more cories. my only concern is the food supply. im only feeding flake food. should i ad in brine shrimp or any other supplemental food?
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Old 01-12-2011, 07:23 PM   #20
 
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yeah he does seem stressed. he is swimmin all over the tank and runninng into all he other tankmates. im planning on going to he petshop this weekend to get 2 more cories. my only concern is the food supply. im only feeding flake food. should i ad in brine shrimp or any other supplemental food?
You must get some sinking foods for bottom fish; they cannot survive on scraps of flakes that may reach the bottom.

There are many good sinking foods, whether pellet, sticks, tablets or disks. Corys are carnivores so shrimp pellets are good. It is always good to have 2 or 3 different kinds, to ensure a well balanced nutrition; also, some are more palatable than others. Mine really like Nutrafin's basic tablet food. I also include one algae or spirulina-based tablet, to ensure they get their "veggies."

Frozen bloodworms are good, but not in excess; once or twice a week as a treat will suffice. And the other fish will love these too, so make sure some get down to the cory(s).
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