Been thinking about it as well as talking to a few people here today and I think I have a pretty good idea of what I plan to stock the 2nd 120g with. Thinking the following...
3 UJ polys (different from the other 120g so maybe moke, albino senegal, teug)
4 Elephant nose
1 Black Ghost Knife
1 Datnoid
I always liked the looks of datnoids but was concerned about the size but I spoke to krichardson since he has kept a lot of them and he thinks one dat would be fine in that tank, so at least as of now that is the way I am planning on stocking that 2nd 4x2x2