Mixed Butterfly tank any surgestions :)

[DEAD_BY_DAWN]

Well i swore i would never get another tank but after being given a 120g complete setup the other week i decided that another reef tank is not what i wanted to do.
So i decided that a mixed butterfly tank might be a possibility i was hoping that there are others out there with similar tanks so any info on stocking suggestions is appreciated .
Tank info
120 RR
30g sump
Euro Reef skimmer (Not sure what size smaller one though no box was included )
Coralife Aqualight pro 150 x2
100lbs mixed Tonga
2-3" Sandbed
Tank came with one Regal Tang + Scopas and ive just added a Copperband .