I've got two UV 57 watt units just sitting here with new bulbs. I'm in the middle of starting a fish dominated tank and wondering if it's worth it to put these two units to use for parasites and maybe some algae control. Anybody have an opinion on whether they do more harm than good or they're worth the 114 watts they'll use? I think that's about the amount I saved when I switched from T5's to LED, lol!