09-10-2010, 12:19 AM
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That would probably work, but I would not go to that extreme. First question is, where did they come from? And I don't mean the store, I mean where did the store get them. As you are in the UK, they may well be tank raised. Cardinals have been tank-raised in the Czech for years, and UK gets a lot of their fish from Europe.
Also, this has to do with parameters. If you have hard basic water, wild caught cardinals will not last long; tank raised, if raised in similar water (another reason for finding out where they came from) will be less likely to have this problem.
What is the aquascape in the tank? Cardinals come from very dark waters, thick with plants or branches and/or overhanging vegetation. Wild fish will be highly stressed in a brightly-lit plantless tank, and even tank raised fish do not lose their natural instincts in this respect.
A group of five is OK, a few more if these settle in would be nice though. But get these settled first.
Cardinals are not fish for new tanks. This fish is highly sensitive to chemicals, minerals, etc.