My first question is:
There is a film of something ontop of the water. It has a rainbow color to it, like when you see oil you put in your car, in water, that rainbow color. What is this? Right now I only have one light bulb working and I can only see the rainbow film on the side that the bulb is working. Will whatever this is, harm my fish?
Second question is about live plants:
I would like to get some! Do I have to take any special precautions when dealing with live plants? Will it increase/decrease the level of anything in my tank? This may be a stupid question, but do I have to quarantine the plants before I put them in my tank? I don't want to bring home a sick plant and put it in my tank and have my fish die.