Firefish or Goby, no cleaner wrasse for sure. Cleaner wrasses have very poor captive success rates in nano tanks. Even in very large reefs their captive success rate is still not very good. Reason being is that probably 80-90% of cleaner wrasse individuals will feed ONLY on the parasites or irritated flesh of other fish. In the wild, cleaner wrasses will service dozens if not hundreds of different fish daily. Obviously when you shrink that number down to a handful, cleaner wrasses run out of food quick
. A select few individuals will accept frozen meaty foods and things like Roe, but a vast majority will not.