34 Gal Stocking

[Blue Ram]

Looking for some feedback on my proposed stocking for a 34 gal cube tank
- green clown goby
- purple firefish
- pair of bangaii cardinals
- wrasse (haven't decided)
What I really want is a scopas tang however reading some info on them seems to recommend that they need a larger tank ie. more swimming room. Anyone keeping one successfully in a smaller tank??
If not a scopas tang, any other suggestions for a colourful fish that is compatible with the others?