I see that my 4 neons and my 2 neons are aggressive to each other. It has qutie calmed down though after 2 days. The aggressiveness is still visible but I don't see that as a problem.

Some fish, like jsmith already mentioned, settle faster than others. Depending on the decor and other factors like size, some might be more established, seeing no other fish around and others quite timid due to the fact that decor is sparsely placed. I'd see a change in that as they will stay together more often with the other 3 added.

Yes, these are quite the adorable fishes. They stay small and also are so tiny that it makes them look even more adorable in the lfs.

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If life gives you lemons, squeeze them into people's eyes and run away!

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Whether or not the bag water is bad partially depends on the water source and the water dynamics of your aquarium. In a new tank, your cycle should be able to handle any extra N-compounds just fine. No less, the real concern is disease. You don't want a disease in the pet shop water to travel into your tank, but this isn't much of an issue in your case as the fish you have would have already been exposed to the disease if there was one (they were shipped in their own tank water).

As to the neons' behavior, hiding and aggression are normal when first introduced to an aquarium. To help them, though, you can shut off the tank light for a day or two so that they have a chance to explore the tank without feeling exposed. Also, as more fish are added, the neons will be less aggressive towards each other.

As to the neon with the torn fin(s), if it is only the ends of the fins (not getting down to the skin), then it should heal by itself provided the water is clean (I know you're doing just that, so I'm not worried). On the other hand, if the tear reaches the flesh, then that could be a problem. Generally, it's best to inspect the fish in the bag while at the pet shop. (Though torn fins aren't generally too bad ever.)

MOA

"Tears aren't a sign of weakness, they're a sign of poor plumbing."

--Dead Men's Lies

If life gives you lemons, squeeze them into people's eyes and run away!

}<(((0>

MOA

"Tears aren't a sign of weakness, they're a sign of poor plumbing."

--Dead Men's Lies

Having such small fish isn't too great on the nerves. I got home from work, didn't see them. They were together behind a rock and plant. Now they're all around the front of the tank. I just can't wait until the tank's fully stocked!