angel & gourami's

I got three baby angel's each about the size of a penny, and two little blue
gourami's,
if any one is around should I just float them in the tank, I got them about
an hour ago.
This is what I have always done however I think netmax told me before when I
got fish last time that when you open the bag, something happens to the
water that can kill them, I have not taken the rubber band's off the bags
yet, so any suggestions maybe I should just get a container and add some of
my water little by little instead of doing it in the bag as I normally
would.
Nik

ps when I am done with this I wanted to post about this place I went today,
its kind of a fish store they have three floors of breeding tanks and fish,
they had full grown discus, and so many different Cichlids, pretty much any
fish you could think of, he had angels that were huge they breed them their
they were beautiful.