Fuel filter Water separator for my diesel storage tank?

[redleg1]

Hey guys, I recently acquired a 100 gallon diesel storage tank with a fill rite 12 volt pump. There is currently no in-line filter of any kind. My question is where to find a good 3/4"-1" in-line fuel/water filter/separator. I've checked a few of the sponsor diesel sites and haven't seen any listed. Also, any suggestions on fuel storage management will be appreciated. Is there an additive to use that will prevent oganic growth in the fuel? I already mixed in DieselKleen for stability. Is there anything else that I should be doing? The fuel is for my tractor and emergency back-up generator, so I want it to be on standby while keeping it as clean and pure as possible. Thanks.