Hi, I just bought my first aquarium today. I plan on it holding cold & fresh water fish. I bought a 30 gallon long tank, bought an Aquaclear power filter (for 50 gallons), and I bought some gravel. I washed the gravel quite thorowly. but in my bucket it would still get a little murky. But it wasn't getting any better the more I washed it so I put it on the bottom of my tank. When I started adding tap water, the water has a slight grayish tint to it. I turned the filter on for about an hour or two but nothing changed (maybe this wasn't long enough). Then, I unplugged the filter and let it sit over night, again...nothing changed this morning. I think our tap water here in St. Catharines Ontario has quite a bit of cholrine in it because when I stand over the tank that's all I can smell. What can I do to clear the water???