So I have a fiji 20 or 24 sump and I previously ran carbon in the area with the incoming drain pipes where it would float to the top before the floss/sock section. I got a reactor for cheap but its nano and the pump only goes up to 90gph (without resistance) and so the water turnover for carbon when in the reactor is probably low (less than my tank which is 75g plus 20 ish sump). I originally did this because I wanted the carbon to be as effective as possible but now I am thinking the old spot is probably better. I was also thinking if a brs reactor for carbon but honestly I am not sure if it would actually be that different than the drain spot. What do you all think? Here is a side pic of the sump design for reference (again not sure if its this or the 24 sump from fiji but this part is the same design).