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.