I personnally have 4 small blue LED lights on my tank and plan to get 4 more. I have been trying to convince my friend that black lights just didn't make sense but I couldn't find any information either way. I'm hoping to get enough information on them that I can show her to discontinue their use and use the real thing. Like I said she got the tank used from a DIY guy which isn't a bad thing but if you don't know what you are using then research is the only answer. I'm hoping to save a few lives and at the same time not be the bad guy. Might not be possible but no information is out there for use on black lights to direct her to.