as m3ace9 said earlier, biopellets should be heavily researched and not used as a quick fix for nitrates. every tank is different so it takes a long time to figure out exactly how much you need for your tank. IMO it should never be added when you have multiple problems with your tank. only when you can identify the changes the biopellets make to your tank.
I use the cadlight reactor as well. i used a paperclip to clear the holes in the plate when it gets clogged. it will mainly get clogged when you have high phosphates i noticed but the paperclip works well.