I've always put in tap water with dechlorinator and some cycle into my tanks, but I have a friend who has always just put in distilled water. I also have heard people putting in bottled water and cycle. What is best? I was told that it is good to use tap water because it contains necessary minerals for fish tanks. The tap water I use has good hardness and not alot of phosphates and I've always used this for all of my tanks. So, what is the best type of water to use?