Review on Gallon Nano Cube Replacement Activated Carbon by Leslie Williams

Pet Supplies should never include this product. The activated carbon filters were completely useless in my aquarium and did not improve THE water quality at all. The only positive is that they fit in my filter housing but that does not make up for their complete lack of ability to actually filter out anything harmful .Don't waste your money on these - look for something else for your fish and aquatic pets..