well as weird as the snot balls appeared they vanished. never did figure out what the y were. Things have been fine the past month until this evening. I clean my tank on Saturday and things were fine, including this morning, I went to dinner with my mom came home and my tank is very cloudy. If i look from one side of my tank to the other I can barely see my fish on the other side.

any ideas? what should i do? i know his tank is clean i gravel vaced it and did a 40% water change.

Can you please post water readings for Ammonia, Nitrite, Nitrate, and PH...

When you cleaned the tank did you clean the filter too???

as nicki asked, also did you use a water conditioner?