I don't think I have any chloramines in the water, but I have not tested for this. When I make water changes, I use Jungle "Start Right" conditioner. The regular filters with carbon, I probably change every couple of months. But, I do rinse the filters when I do a water change. I don't know if that is the problem or not. But I've had my 55 gallon aquarium for 1 1/2 years and I have never had this problem before. As far as my Bio-Foam, I am probably due to replace them. The box suggests to replace once a year or when it begins to show signs of wear. Mine looks just as good as the day I bought it. After just looking on the box, it says to rinse in the same temperature water as the aquarium, which I normally do, but I do believe I have rinsed it a couple of times in hot water when it was really gross and slimy. This may be one of my problems.