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Originally Posted by gereld_hor
oic... so nw currently i on my uvc 24/7, will it affect the growth of my BB in my sump tank?
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nope....not at all.
like what bro AroboyII stated........just install the UVC before the water is returning to the main tank.
UVC only zaps free floating BBs (which is less than 2% of the total population of BBs).
Most BBs reside on your bio-media (about 98% of the total population), and they can multiply there w/o being affected by UVC.
So for those free floating BBs in your main tank to get to to those bio-meida.....w/o being zapped by your UVC..........do not put UVC before going to your sump. It has to be installed after the sump (before water returning to the main tank).
HTH