Brand new fish tank has foamy bubbles?

I just set up a new fish tank last night. Got a round, 3 gallon tank with a tube down the center to put the airator (?) into so the bubbles stay in the tube. The tank had 5 glowfish in it (down to 4 now) and is completely covered at the top by foamy, soapy looking bubbles. I've been reading some things that say this is normal for a new tank, but I'm worried, since one of my glowfish already died, less than 24 hours into the new tank. Should I be concerned, or allow the tank some time to grow some natural bacteria before worrying?