I was wondering, sense most people say change your water ever week or so in a 29 gallon tank. Could I run a hose from my spring water, which is 6ph not hard water, no chemicals, and let it drip in say a gallon a day. Then have another hose draining it a gallon a day. Would this be healthy for the fish, considering most live in a high water exchange rate place naturally. I understand i would need a nice heater, to keep the water at 75 80, sense my water comes out at like 40 degrees f. Would this be a good idea though, instead of changing my water every 7 days. There has gotta be a way to make a tank a self contained bio sphere with no out side help, once it set up . Btw my tank is 29 gallons, i plan on putting mollys, and bettas in it when its done cycling. Thank you very much for reading and any help you could offer. Also its not really the work or tie involved in changing the water im trying to avoid, its my concern about spreading fish tb around, considering i have kids. And ive read a case where i child got it from coming in contact with the water. So the least amount of contact with the water is what im looking for.