how should I polish water

[fishguyxd]

I have small particles floating around the tank i would like to get a clearer water look should i add a charcoal filter along my filter floss or add purgen ?? seachem product in a media bag and put it in the sump or any other ideas. other than putting a extra filter ie rena or fluval cannister on.

Also this maybe a goofy question but how do I know if i have pods etc in my tank for feeding some of the stuff floating around is just mini ??