Ed, if you're still interested in Cardinals check out Apogon parvulus, the Red Spot Cardinal. It's adult size is around 1.5" and they school very nicely. Unfortunately, they don't survive transshipment very well. I ordered 7 and only 1 survived the first few days - however, he is bullet proof. I'm tempted to order more but feel bad about the harsh mortality - nonetheless a school of 10 or so in my 60g would be SWEET.
They used to be very inexpensive ($5-$10) but due to increased interest they are now a little more expensive ($15-$20). Any of your local shops should be able to keep their eyes peeled, I know SDC had some a few months back. They are getting more popular in the States so it shouldn't be hard.
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