12-05-2011, 08:22 PM
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PH of 7 may not be good for your fish depending on what you keep, but that's off topic. Testing water is very important, even those who are new to the hobby should get into the habit of testing your water.
How long has your tank been set up? New tanks require more water changes to help keep ammonia levels and nitrite levels under control, even in lightly stocked tanks. Mature tanks will have a more stable chemistry and, in lightly stocked tanks, can handle less water changes.
If you give us the age of your tank, size, filtration, and stock, we may be able to help assess if you are changing enough water each week.