sorry if this is in the wrong fourm but i have a 235 gallon tank so i figure i will change about 100 gallons a week. so thats about 400 gallons a month. on average (this is people with 200+gallon tanks) how much more is your water bill after you added your big tank?? like 5 10 dollars a month? (hope its not more than that i might have to chip in 
