How often to change UV light bulb?

**astro** · 13th Aug 2012, 18:22

Any idea?
Can recommend a external canister filter with built-in UV?
Thanks

**astro** · 15th Aug 2012, 00:15

Any1 know?

**Shadow** · 15th Aug 2012, 09:51

is this for planted tank? you are not suppose to turn on UV light 24/7 on planted tank because it will oxidize the celated iron.

**astro** · 15th Aug 2012, 15:40

No, it is not. Using it on my tank of silver dollars & silver arowana for many years 24/7. Dont know still effective onot

**Shadow** · 15th Aug 2012, 16:03

NA uncle lust time told me that the uv set have those opening that will glow blue color. If no glow that mean need to change. However model to model might be different.

**astro** · 16th Aug 2012, 22:26

Opening?? Let mi check

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