Hello!! I need some advice on my goldfish tank water. It is a 50G tank and I've got two Marineland Magniflow at 220Gallons/hour each. All parameters are perfect, Yet I still don't get crystal clear water like I do in my other tanks. The aquarium has been running for one year now. Population: 4 goldfish, 6 corys and 4 Bumblebee catfish (water at 72 degrees) I've been changing about 25% water every 2 days but still... not as clear as I'd like to see it. I feed them bloodworms, 3 different kinds of Hikary pellets for goldfish, Api for bottom feeders, and other two foods I can't remember their names now. I have just done search here in the forum and saw you guys talking about Seachem Purigen. I'd like to leave additives as last resource but if that's the thing to do I'm up for it. I know Goldfish create a lot of waste but I don't know if four of them are too many.