yes I too know of many systems that use tap water, and most of them at one point or another get ran over with some type of algea, wouldn't it worry you when I just told ya all the things that happen to tap water? Get a print out if you can of your city water, You'll know what I mean then. over time that stuff builds up! I'm talking years not weeks and then your tank crashes all of a sudden. If you have to add chemicals to your water to make it right then thats already one step in a bad direction. If you want to do it right then save and buy one. its like $150 compared to the rest of the tank setup thats cheap!
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