I definitely think having it drain into the filter sock is ideal. It would help prevent algae escaping to your main display. I can also see a fair amount of noise being made by the water trickling into the filter sock. Just my thoughts.
That's what I was thinking and having more options then just one. Not sure witch approach to take on this idea since I only have one shot at it. The only reason I've been thinking about this idea is because I've been having some bubble algae and cyano in my Reefer 170 and was thinking about ordering a algae scrubber. then thought about this little tank since I don't use it as a ATO. I was going to make it a fuge but then again imo I don't think a fuge that small would really pack a punch.