Hello I currently have a 20g tank with 6 mollies, 4 tiger barbs, 2 dwarf gouramis, 1 betta, 1pleco, and 1 shrimp. My tank seems a bit cloudy and I'm thinking it might be due to overstock. Tanks currently running a fluval 50. I have done a 30% water change which helped but I'd like to get my tank crystal clear and my parameters on track. Everything else was good except for the nitrate and nitrites. I don't have specifics as I only have the test strips for now. I'd like to setup a double sponge filter in my tank in addition to my fluval 50. So my question is would it help any?