Whats Wrong With My Guppy

[cheekymonkey]

After following instructions on the board and carrying out a 5 week fishless cycle, I finally made it. Did a 80-90% water change today and went out to purchase my first batch of fishes for my 30l bioorb.
I chose 4 male black tailed guppies. Got them home safely and introduced them to their new home.

Since then, its been 5-6 hours now and I've noticed one of them keeps swimming at the surface and appear to be gasping for air whilst the rest are happily swimming at mid level going round and round the bowl endlessly.

Should I be worried?

 

[SJ2K]

Hows it being airated?

 

[cheekymonkey]

Hows it being airated?

I assume u mean do I have an air pump for the orb, yes, and I've only filled it up to recommended point (2" above air tube). I've got no real plants in the orb yet.