So my biocube has been running great for 10 months. I recently set up a frag tank and it was saying it was fully cycled. So i moved all my corals to the frag tank and noticed my corals werent as happy as before. I tested my aquarium and it showed very high nitrites. So i moved all the corals back to the biocube and now its show nitrites at .25ppm. Why would this be? I havent done a water change on it in three weeks. I also run nitrate/ nitrite reducing pads in my tank. Any body has any ideas that would be great!!


