Thanks for the response! I guess its a tough call, attach my nice UV sterilizer to a brand new, work horse, permanent filter like the CFS500, or attach it to my fluval 404, that i essentially picked up for free and would be superfluous to my tank setup. I am sure the sterilizer would benefit from the slower flow of the 404. Either way, i am faced with replacing the crappy ribbed hoses that both these filters have. Any recommendations there?