I've got a stupid question. - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 12 Old 02-20-2013, 10:52 AM
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Cory cats will school together, but a lot of people believe that you should have at least 5 of one species before adding another species.
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post #12 of 12 Old 02-20-2013, 07:12 PM
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Agree. And on the upside down catfish question, it is lonely. As it mentions in the profile, this fish is best with 3-4.

Others answered the group question, but this is very important. Shoaling fish live in very large groups of their own species. They must have a group of that species or they will almost certainly be stressed, and that cause poor health and brings on disease. Almost all fish disease is initially due to stress, so avoiding it is always best.

There can be several reasons why a particular fish needs a group. Security is obviously one; the more fish there are together, the safer they will feel. But many have social interactions, or perhaps a "pecking order" within the group, and this is an essential part of the fish's character.

Studies have now proven conclusively that shoaling fish that are not kept in minimal groupings will display increased aggression, and this cause yet more stress.

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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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