Help!

A few hours ago I went to my LSF to get some tropical fish for my new
aquarium (which is apparently still cycling). My home test kit showed
elevated levels of ammonia, so I took a water sample for testing at the LSF.
They confirmed it was somewhere around .6 ppm ammonia. Also, my water was
yellow and smelled bad. I panicked and did a 100% water change for my new
fish, even though the danio's I had for cycling were fine.

Now with the new water, I have 0 ppm ammonia, but my nitrite rose to .1 ppm
(it was previously 0). Needless to say, my fish are gasping for air and
laying motionless on the gravel (sometimes).

What can I do to help them get through the nitrite spike?
I don't want them to die by morning!


Current tank parameters:
pH: 6.8
dH/kH: ?
temp: 26C/79F (eventually, the heater is still working)
ammonia: 0 ppm
nitrite: .1 ppm
nitrate: ? (none, I guess... i don't have a tester for this)

I have 2 guppies, 3 neon tetras (starters) and 1 "anubias nana" plant.

Thanks in advance for all replies.