So I did not want to add a second 2 little fishies reactor to my sump becauseof space and maintainence time. So I took a chemipure bottle, drilled 8 holes in the bottom of it, cut a hole in the lid that would let me screw in a nipple and connected 8t to the output of my 1 reactor and set it in my sump. Best part is to change out the carbon I just open the lid, remove the old bag of carbon, put in a new one, put the lid back on, rinse in the sink or attach it to my reactor when adding new gfo and the new gfo has rinsed out and run till the carbon runs clear too. All I run in my sump is chaeto so no issue with taking up space in there. I love it.

