Really? White clouds can live in warmer water, but feel much more comfortable at cooler temperatures. GBRs on the other hand *need* warm water to thrive. 79° minimum, more is better.
GBRs are tricky. Sometimes they do surprisingly well despite poor conditions, and then they suddenly die. But they are definitely not hardy fish, captivity bred or not. GBRs need high temps and very good water, which also needs to be on the soft side with a PH no higher than 7. I would stay away from GBRs in a 10g, simply because of the lack of stability such a small tank provides. The tank is definitely too small for cardinals - no experience with von rios.
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