I only used the overflow box. I then cut the inflow part of the g6 to make it shorter. I also have my other closed loop pump that going into that overflow as well.
I used some of my leftover glass frosting around the clear part. I still need to do something about the black U pipes. What I might do is use the other piece and drill some holes and have both returns go though that.
Yes, that is my gimmicky freshwater hydor volcano under some petrified wood which imo came out nice. I have my apex turning it on at night with bubbles.