Interesting. It has occurred to me that using a large UV on a small QT would be the functional equivalent of TT .... just not as stressful.I would like to encourage you to read about the Tanji system used at Monterey Bay Aquarium. The link is listed in this thread. You will notice the proper use of U.V. and the article does not mention any prophylactic treatment of the fish...they may, it is just not mentioned and would not play well with their bioreactor filtration design. The systems I designed for my customers follows the same path and those stores experienced less than 3% loss rates. I would strongly recommend this type of QT system if you can afford it instead of the cross your fingers and hope chemotherapy does not kill your fish during or after treatment. The shotgun approach of trying to kill any and all possible disease vectors is in practice very detrimental to the long term health of the fish. I killed way more fish with this approach and much higher loss rates than with proper holding system design. So you could say I advance QT in a proper holding system versus prophylactic chemical means. You can accommodate this just by using proper U.V. on your display system.