Nasty, as in disease run rampant, anaerobic bacteria developing and ammonia rising due to dead Nitrifying bacteria, or nasty as is lots of algae and cloudy water? I'll try finding your other thread and see what your talking about.
sorry if i wasnt clear, its basically really dirty and the water is goin yellow. and the floor is covered with thick algae , and everything is gettin nasty, ill go with phantom thief, thanks !phantom