Would a uv be good for a mixed reef with fish reason im asking is that i had a fish die saw a white stringy hangin from his body like he was taking a poop so i bought dr gs anti parasitic food but he didnt make it lost 2 other fish as well and my 2 pj cardinals have a swollen eye so im figuring its something in the water or one of the fish i got had some sort of parasite i still have other fish in the system so would a uv help or do i need to take out all the fish and set up a qt tank