Hello, I just purchased a small 3.5 gallon gold fish tank for my little girl. It’s been 3 weeks and sadly we’ve already had 2 goldfish die. Before I get another fish I want to make sure I’m doing everything right. I tested the water and the ammonia level was really high. I then got tap water and treated it with prime but that too still has an elevated ammonia content (1ppm). What can I do to bring those levels down? Really don’t want to kill another goldfish.