nc_nutcase;3273579; said:City water has a small amount of chlorine in it...
Chlorine can/will kill bacteria...
The chlorine levels of city water vary considerably from city to city...
Adding enough water to an aquarium to replace evaporation is very (very very very) unlikely to add enough chlorine to the system to be detrimental to the bacterial colony...
Without knowing specific details of your water, your aquarium and your exact replacement method could anyone say yes or no with 100% certaincy... but many will try...
In personal experience with my local city water... I'm willing to do up to a 20% water change without adding dechlorinator... although dechlorinator is cheap enough that I typically add it anyway...
Personally, when adding 5 gallons or so to a larger tank (75 gal+) I do not add dechlorinator...
Whether or not to add dechlorinator will be a personal choice... let us know what you decide and how it works out for you...
Thank You very much, very informative. I will probably add about 10 gallons a week but anyways i will buy dechlorinator just to be on the safe side.But will i have to wait 24 hours after using the dechlorinator? or just put it in then pour in the water?