Hers my take on UV sterilizers the cost to buy, cost to run and maintain plus they need to be taken apart for monthly cleaning, need new bulbs at least yearly and add heat to the tank.and what do they cure Green water, so does limiting the light
and proper tank maintenence,depending on the flow rate and length of exposure
they control some parasites,so does quarantining new fish.I've had fish since i was 6 so thats 19 years my dad keeps fish and my grandfather kept fish.With no need of UV sterilzers.But if you want one enjoy odds are you'll need a seperate pump and prefitler for it also-Anne