Thanks guys,
Today i went to a local fish shop , specialized in african cichlids, and they adviced me with Pseudotropheus msobo & pseudotropheus demasoni from Malawi , or any species from Neolamprologus family (shell dwellers)from lake tanganyika.
The pseudotropheus are really beautifull, and the breeding is amazing also.
As far as Neolamprologus are a bit colorless, but also very interesting in terms of breeding
The tank has 19 kilos of rocks, with plenty of tunels and hiding places.
The rocks are named as moonstones, adequate for cichlids.
The shop owner advice me for 6 msobo and 6 demasoni, to avoid agression between them or 3 diferent groups of neolamprologus.
Ill make a new round tomorrow at the store to talk see them better.
Happy weekend all