Its coming along nicely, i would say add another piece of interesting driftwood, or (as you are already planning) more plants it should look pretty good... although i can't help but ask,what sort of puffer you planning on putting in and are the cups staying in the tank like that???
you said the tank is 120L so if i'm not mistaken thats roughly 30G??? in which case i'm sure your two F8's would enjoy it... since they'll still have their "personal" space...