I did a 90% water change last night and at the same time, cleaned the sponge filter, as well as taking the filter apart and cleaning it up as well. The water is finally actually clean now!! It is a little bit cloudy but you can see the water is clear, there is nothing floating around, no particles etc.
I may try some Accu-Clear to get rid of the rest of the little bit of cloudyness. I will check what my readings of Ammonia are again tonight.