I think we can all agree a CBB is a very delicate fish. Also an aquarium 2 weeks old is not suitable for any fish.
I have a strong opinion about cycling an aquarium. Most people believe a cycle is when the nitrogen cycle goes in full swing from ammonia to nitrite to nitrate. However, a fully cycled aquarium should be considered one that has been given enough time colonize enough bacteria to be able to fluctuate with the nutrient loads that go up and down in a new tank. Even though you saw no rise in ammonia, that doesn't mean your over all water chemistry is stable.
Please do not take my critism as negative, but see my perspective as being pro active against the death of fish we have no right to even remove from the wild. Let's give them the best home possible if we must have them.