Blacklight no good without very super filtration. The tiniest particles will show up and make normally gem-clear water look cloudy. You'll want to probably stack carbon in line with diatoms...I really cannot guess as to what kind of filtration would be needed.
Also, a 15w tube blacklight might reveal weird stains on your walls (or ceiling) that'll make you run and fetch industrial solvents then hire a painter.
...Happened to me once. I'm better, sort-of. Skittles seem to help. :/
Oh, hey, grats on the graduation NoDelta!