I have my tank since Christmas. I have a filter and an airator. The water which I added to last week with the proper Aqua Safe drops is now cloudy. I have a 10 gallon tank with a charcoal filter which I changed recently. Why is the water clouding up so fast.???Any help is appreciated. IT got cloudy in one week. Does anyone know why....what should I buy or look for? Want the fish to be safe and not die. Thanks.