I have one betta fish in a 2.5g fish bowl. I've had him for five weeks now but I just found out that it is important to condition the water since I use tap water. My fish stopped moving for awhile after my last water change, but he's completely normal now. He even built a new bubble nest. I'm not sure how much chlorine is in my water, and if chloramine even exists there because he seems completely happy and healthy. My dad got this water conditioner awhile ago, and I'm not sure if it's safe to use or not. Does it also protect against chloramine and other deadly metals or just chlorine? Also, if I were to change the water, should I add the recommended amount for 2.5g or just for the amount of water I am going to replace it with? Thanks so much for your help in advance. It really means a lot!