Tropical Fish Keeping - Aquarium fish care and resources

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-   -   White Clound Mountain Minnow - Aggressive? (http://www.tropicalfishkeeping.com/cyprinids-atherinids/white-clound-mountain-minnow-aggressive-65169/)

newfish45 03-13-2011 05:00 PM

White Clound Mountain Minnow - Aggressive?
 
Hello. I know that white cloud mountain minnows are supposed to be a peaceful schooling fish, but my group of 5 seem to really chase each other and my other fish. Is this common? They have been chasing my lemon tetras and cardinal tetras. I have moved them to another tank due to temperature differences, but I was curious since they were so busy chasing the other fish...

stevenjohn21 03-15-2011 09:21 AM

what size tank do you have ? and how many fish in total are there?
They are good community fish and mine school together without any problems among the other fish in the tank.

Byron 03-15-2011 09:34 AM

Shoaling fish (meaning, fish that live in large groups in nature) must be maintained in groups in an aquarium. Six is usually considered minimum for most shoaling fish, though there are exceptions (needing more than 6). When shoaling fish are kept in smaller numbers, aggression is often the result, even from otherwise "peaceful" species. Not long ago I posted a link to a recent study proving heightened aggression in shoaling fish when the group was less than 5-6.

The other issue is tank size; fish in tanks that do not provide enough space also will frequently show increased aggression, or aggression from again an otherwise peaceful species. Fish that like to swim, such as White Clouds, need space to do so, or they will feel "boxed in."

Temperature is another factor. You've mentioned that, so I won't say more, other than keeping cool water species in warmer tanks can cause stress, and aggression is one result of stress.

Byron.

newfish45 03-15-2011 08:39 PM

Thanks for the info. It is a 45 gallon tank. I had 6 lemon tetras, 6 pygmy cories, and the 5 white cloud mountain minnows to start (initially 6 of each,but one white cloud passed away). I then added 9 small cardinal tetras and 4 more pygmy cories. I also don't believe that all of the pygmy cories are accounted for. They were very shy and I couldn't get a full count.

I have moved the white cloud mountain minnows to a cooler tank. I am thinking I will see if the LFS will take them back since the other tank is only a ten gallon. Hopefully the white cloud mountain minnows are happier in the other tank temporarily.

I am now seeing more of the pygmy cories and they are starting to swim with the tetras again, so I think things are improving.

Byron 03-16-2011 12:30 PM

Quote:

Originally Posted by newfish45 (Post 619517)
Thanks for the info. It is a 45 gallon tank. I had 6 lemon tetras, 6 pygmy cories, and the 5 white cloud mountain minnows to start (initially 6 of each,but one white cloud passed away). I then added 9 small cardinal tetras and 4 more pygmy cories. I also don't believe that all of the pygmy cories are accounted for. They were very shy and I couldn't get a full count.

I have moved the white cloud mountain minnows to a cooler tank. I am thinking I will see if the LFS will take them back since the other tank is only a ten gallon. Hopefully the white cloud mountain minnows are happier in the other tank temporarily.

I am now seeing more of the pygmy cories and they are starting to swim with the tetras again, so I think things are improving.

Sounds good. As you are experiencing first hand, there is a lot of wisdom in carefully researching a fish species before acquisition, as many may not be well suited to a particular environment, and having fish in a community tank that share the same environmental needs is a major step to healthy, happy fish.

Byron.

newfish45 03-16-2011 08:56 PM

Thanks for the info and comments. I need to remember when I am at the LFS to stay on track with what I have studied and not rely on their info for certain fish. After this event I am now going to think about their suggestions and trust the info I have found here and researched myself.


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