I am working on cycling another 10g tank. I haven't added ammonia yet. I set the tank up a week ago and filled it up with water. My equipment is used, but clean. A two days ago I saw little worms in the water and than yesterday the water got all cloudy. Today I can see small fish that look like fry in the water. I don't think that they are mosquito larvae, but I haven't added any fish and I have no clue what they could be. Does anyone have any idea how they got there and what they are. I think I am going to drain the tank, but I want to know what these little things are first.