18W UV Lamp for 3 ft tank?

[jiahe88]

can i check above mention isit suit a 3ft tank? because the box status as for ponds? can any body give me a reply with more information and what a 3ft tanks need, like how many watts etc. . thanks

[eagleray]

I am using a 9w for a 2.5ft tank .... not sure but I guess your looks much more than enough ....

Guess it also depends on the pump which determines the flow rate through the UV

[jiahe88]

i using a atman cf600. flow rate is 740L/H filter volume is 300-400L. Is enough to put a 18w uv? still got any expert can give soem advice? me intend to get it soon.

[eagleray]

Not sure .. but i think should be ok ... the idea is that

if the pump rate is too fast ... the water will have very little exposure time with the UV tube, so will take much longer time to kill it as it would require several passes ...

but if the flow is too slow, then the UV will not be able to kill off the bacteria or algae fast enough (i.e. those in the tank will be re-generating after than the uv killing it)

I am using a E501 (300L/h) with a ATman 9w uv (cannot remember model) and it works fine. Got rid of my green water in about 2-3 days. Tank is about 140L.
Do note that E501 is not my main filter ... have another ehiem 2026 as a main filter ...the UV is connect to my E501 as I hope to use it on a temporary basis

[jiahe88]

can someone still explain to me isit useful for a uv light to put into a planted tank? Does't it cause any problem like hurt the plants, fish ..etc?