oxygen levels

Question
I've read a lot that high oxygen levels are good for fish. I have a 30 gallon tank and I was wondering how do you test for oxygen levels and how do you raise themif they are low?

Answer
Hi Matt: I found this question in the general pool of questions and though its a few days old I thought I would try to answer it for you.  You can purchase an Oxygen test kit at most aquarium stores... you use them like you would a test for ammonia, etc.  Oxygen in water varies by temperature and source.  High temperature water holds less dissolved oxygen then does cooler water.  If you warm your water then add an air stone and air pump to your tank... most aquarium should have an air stone and air pump as standard equipment.  Hope this helps... dave