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My understanding is that it's not so much the wattage of the UV versus the water contact time with the UV light that kills algae/parasites, etc... The 9w green killing machine is only putting around <50gph over the UV light with the small included pump. I'll know in a few days if it is enough to kill dinos in my 20g long coral quarantine tank!My lights are off right now and I see no signs of the Dino's. Seems they are only out with lights on? Whatever it is, it doesn't bother my trumpet coral or Cali tort sps. I will respond back with a white light pic after my lights have been on a bit.
I can get the 9 watt green killing machine today if I should jump on it now vs later. I don't know if I can fit the 24 watt one in my tank. I read somewhere that UV under 15 or so watts is not enough to kill much of anything but may clear green water.

