Turn the C02 off 20 mins before introducing the fish, this can shock them. I think all cardinals from all over (im in UK) are tough to aclimatise to new water. Every time my LFS's get batches in they quarantine them and I always see a good number die before they go on sale. My Girlfriend bought 6 and 5 died, I have had about 20 in total and a couple always die from each batch.
Saying that I just transfered 2 from my main RO water tank to my girlfriends Tap water tank and they were fine.
Were quite lucky in the UK to have a sp[ecalist fish release device. Basically it slowly sinks and mixes your tank water with the water the fish has come from. it takes about 40 mins. Once full, you net the fish and drain the mixed water to a bucket. ill try to find a link.
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