Post #655003 by MadDogMike on Tue, Oct 9, 2012 8:13 PM

Tonic water glows under blacklight? That's a new one to me, must be the quinine. Swizz is right about the algae, I keep it down in my outdoor pond by blocking out the light with floating plants (water lilies and water hyacinth). If it's kept in the dark, has no organic matter, and is recirculated and aerated frequently it should stay clean.