Hi, OK so I am not new to the aquarium scene but this has absolutely baffled me. So I had acquired a new 60 Gallon Aquarium, (I was very excited) Now after I purchased the Aquarium immediately began setting it up, I have 2 decent bubblers, I also have a Marineland Emperor 400, and a Marineland Penguin 350, So i know i have PLENTY of filteration, (I know that Overfiltration is the name of the game) and i used a simple National Geo Sand that i purchsed as a substrate, now i let the tank cycle for some time and, I do believe that this is the source of the problem because I did not cycle the tank for very long at all, but I did test it and it had no ammonia so I assumed it was ready for fish. I added 4 fish all Fancy Goldfish ( 2 Orandas, 1 Ryukin, 1 Black Moor) And the water got slightly cloudy but I figured this was normal because of the sudden spike in ammonia that adding 4 Goldie's can have. Then the water became Crystal clear. I was extremely happy, then one day i noticed that the black moor was having extreme issues and would not eat. i tried for days to find the problem but was unsuccessful, so after i lost the black moor i replaced him with a large beautiful blue/Calico oranda then i got up the next morning and my tank was like there was a small blizzard in it, it was impossible to see anything. For a while i could not find the problem and then i found that much of the food they had been eating was getting caught in an artificial plant i had in the corner and had been rotting and causing the ammonia to spike so i removed the plant, did a 25% water change and made sure i removed all the rotting food. Since then i have been doing 20%-40% water changes everyday but I cannot get the ammonia to go down and I cant get the water to clear up, I am using seachem chemicals and i also added an amazon sword plant to help eat up some of the ammonia but I CANNOT GET IT TO GO DOWN, so im hoping you guys can help me. Its starting to effect my other fish