| Dirty Tank
I just bought new fish (2 koi and 1 algae eater) and put them in my fish tank. The water and filters are new, except the rocks are a month old, used by previous fish.
When I poured the water into my tank, it was fuzzy and not so clear. I replaced the old filter with brand new ones. The water cleared up after a few hours. About a week has passed and now the water is a little fuzzy.
Is it because my new fish are swimming fast around the tank and stirring up dirt from the old rocks? Any ideas? | 
