Re: UV-filter which one what do you want the UV for? Clearing Green Water, or killing parasites? it takes more power and longer contact time to kill parasites.
So if you want to clear GW, you can save some money, but if you want to protect your fish from an ick outbreak, you need horsepower, so buy more "watts" than you think you need.
Most manufacturers provide a chart with wattage and flow rates for various tasks. Do some research before making your choice.
AB |