Hi Jody, welcome! What you need to be looking for is information on the nitrogen cycle. In your new tank, as fish produce waste, that causes ammonia in the water - which is quite toxic beyond a certain amount. You do need to let it build up a little though because that will attract the (good) bacteria that feast on it and turn it into nitrites.
Nitrite is also fairly toxic to fish, and, as that builds up, it will attract more beneficial bacteria ("BB") that convert the nitrite into nitrAte. Nitrate isn't great for fish either but its *much* less bad than the other two and is expected in modestly low quantities.
People may tell you to not to do water changes early on to allow this cycle to happen, but really, you need to closely monitor the ammonia, nitrite, and nitrate levels, as they develop. If they get too high it is extremely dangerous to the fish and at that point you should absolutely do a water change to bring them back down. At the same time, you do want a little ammonia/nitrites to attract the bacteria that will allow your tank to complete this 'cycle.'
"Don't do water changes" seems to be blanket advice that's 'hit or miss' - either it'll work and your tank will cycle, or it'll kill some/many/most/all of your fish. At your lowish pH, you're running more risk of the latter, since the BB may have more trouble establishing at that level.
Its good that your fish seem okay, but you should keep on top of your test results to make sure conditions don't get bad. Also, may I suggest picking up some water conditions - I'd recommend NovAqua+ and AmQuel+- to keep those things in check and keep your water healthy (the former will increase alkalinity, and add vitamins and electrolytes - the latter will remove chlorine/chloramines as well as detoxify ammonia/nitrite/nitrate). They are good in addition to - not instead of! - appropriate water changes.
I hope that helps you begin to learn about these things. Happy fish keeping! And remember, 'fish keeping is water keeping.'
P.S. At that size tank, I hope we're talking 'fancy' goldfish and not commons/comets, yes?
QUOTE(jodyny @ Dec 24 2007, 11:22 PM)

Hi,
I have a new tank about 2-3 weeks old. 36 gallons and 4 goldfish. I have a few questions.
1. I was told by a "fish" store in Columbia SC to not do water changes for the 1rst month as it is a new tank.
What do you think?
2. My water is very cloudy. I keep testing the water with Quick Dip strips. I have an ammonia reading of .5. The
pH is 6.8; alkalinity is low - moderate at 40-60; chlorine at 0; hardness is 150; nitrite is 0 and nitrate is also 0.
My fish seem fine - very active and hungry.
Appreciate any help. Thanks and Merry Christmas!