with your pellet volume, i would go much much slower. i think you should start at 50g. i have used pellets and found it very hard to manage the bacteria produced by them. with too much in the device, you will find everything crashes and you will get clogged up with snotty textured goop.
i have just turned my reactor off. while it helped me get down to ultra low nutrient levels, it has released the bacteria into my system so now i have a problematic deep red furry velvet-like algae that is very hard to get rid of.