hello,
first Q: how to hide the airline: you could use a piece of wood, a fake plant, or something of that sort.
2: selection of fish: their are a couple of options. you could go with a school of glowlights, or some cardinals. then later you could add a few danios, or white clouds. you could also add a few small pygmy cory's. in my first 10 gal. i added a betta fish, however, this is controversial as some say that tetras are a little nippy. i found this not true, or my fish is an onomoly (spelled WAY wrong! lol)
you would have to add these in very slowly, over a period of months, as this is pushing the limit.
i would start with 3 glowlights (a little hardier that cardinals and neons)
then a few weeks later, when your water is good, i would add the cory's. (2, preferably 3-4, as they like to be in groups)
again, later on, when your water is good, the danios (3)
mabey, and this is a large mabey (like this : MABEY) (lol, a little on the random side) add a betta, but i would shy from this.
anyway, i have found that this setup has worked exellent for me in the past, and still is up and running (my first tank years ago) and doing well
good luck!
Rugby