Layer of bubbles on top of tank.

Question
Hello,
I recently bought a freshwater, 10 gallon tank and set it up. For a week, it was
fine. Then, I bought two, small fish to act as a test run, one black  molly and
a small glofish. For about three days, everything seemed to be running perfectly
until I saw some white spots on the black molly and assumed it was ick, it died
within a couple of hours. I have refrained from buying any other fish since
then. It's been nearly a week since then and my glofish has been perfect, I
bought an ick treatment and treated my water for fear of it contaminating future
fish. It's been two days since I treated it, and still everything seemed normal.
Yesterday, I noticed my water level a little low and added a small amount of
water not even enough to fill it to the rim thinking I should add it gradually.
Along with that, I added the recommended amount of a water conditioner that
neutralizes the chlorine in the water. This afternoon, I saw an accumulation of
bubbles (not foam) but bubbles on the top of my tank which are from an air pump
that I have releasing bubbles. However, until now, they have always been
distributed evenly. What happened?  Should I refrain from buying more fish?
Sorry for the long explanation, I didn't want to leave anything out.

Thank you, Stephanie.

Answer
Stephanie,
You tank is going through new tank sydrome, called cycling.  Here is an article about cycing.  Do not add anymore fish until 8 weeks after the startup of the tank.  Change water 50% every other day or so for the next few weeks.  Test your water daily.  

http://www.badmanstropicalfish.com/articles/article34.html