Pak n Run aka PaknSave ususally has small frozen fish in their fozen section - Whitebait and they also had something else.
Could also try their frozen seafood mix or Frozen prawns
I thought the aulonocara ( dragon bloods ) are crossed with the mbuna and the line bred for the selective traits of the obs, eg the OB Fire etc. So not necessarily aulonocara x mbuna. Well that's my understanding.