I used to have a comet in and unfiltered tank( tut tut tut) until i went to my local aquatics shop and brought another goldfish (a shubunkin) and a filter. The day before i got them, i did a partial waterchane to my tank so that it was all clean and fresh for the new arrival (it was partail water change day anyway.) When i got the fish home i put it in the tank and installed the filter. Then i suddenly noticed how dirty the water and the gravel was. It was the perfect exsample of a goldfish tank that hadn't seen a filter before. Pretty yuck. The next day i did another partial water change in a frantic hope to rid the yellowish debri floating water. I even scrubbed the sides of the tank to wipe away the algea, rinsed the live plants and stirred up the gravel in the tank so i could catch the debri with a net. Then the water turned cloudy! I put my goldies in another disused/hospital tank to wait until the cloudiness setlled down, but it didn't! Then i put my goldies into the cloudy tank, thinking it was okay. Was this a bad idea and why oh why is my water soooo cloudy?