I just installed one of these to dose h2o2 in my tank, but I'm a little confused by the instructions. Should I see bubbles or not? From the diagram it looks like the catalyst causes o2 to accumulate at the top of the acrylic container and the pressure buildup forces out some h2o2 out the bottom of the acrylic container. When I first put it in yesterday I did see a faint stream of bubbles coming from the container, but this morning I only see one big bubble every minute or so.