Hey Picassoclown, always great to chat w you. I totally understand your goals to do this naturally. As far as the UV etc I was just trying to get a idea of what you had in your sump or if you even had one to help offer suggestions. I am just going to share what I learned from all the cool experience people here on R2R and from my years in this hobby, making right and wrong choices... UV to me is just a tool to help control issues or help keep ick etc in check or to a minimum, my safe area answer as I do not know if it ever eradicates ich etc. As far as water cloudy it should clear on its own and maybe carbon would help, if for sure will not hurt. I like chemipure blue ever since Vetteguy turned me on to it . I run carbon sometimes. like 2 weeks and it is never constant thing as I have 6 tangs and I hear about it may cause HLLE in them... As you know this hobby is ever changing and new ideas good and bad always pop up....I am always here for you to offer suggestions to make you think about what good for you and your final goal...even if you do not like my ideas or you do, at least your getting ideas to make you see other possibilities....