Hazy Freshwater Aquarium?

I have a 60 gallon Freshwater tropical aquarium stocked with a pleco 3 tequila sunrise guppies 3 adult mollies 5 baby mollies and an upside down catfish. tank has been doing fine for almost 4 months temp ranging from 79-80 F PH constant 7.2 ammonia never higher than 0.20. during the most recent filter change i noticed the water got cloudy white i tested the lvls all was good so i let it be, after two days i removed activated carbon and added clifier tablets as per instructions on box great fun fizzed and turned water purple, when purple subsided there is a greenish yellowish haze now, levels are still fine including nitrites and nitrates, also no live plant life only plastic plz advise :)