We've had the new 55 gallon tank filled w/water for 1 week, with 7 fish living comfortably and happy (3 tetras, 3 swordtails, 1 gourami). Today the water smells moldy. Help!! What is my problem?
well, not quite sure what mold smells like, but, does it have a strong odor? or is it more a dirt-like smell?
if its a dirt smell, then that is fairly normal, a strong odor isnt good, but u can always run activated carbon to remove any smells.