Don’t think these are balzani. I think they’re Herotilapia- you may want to move themI grew out a shoal of these in @ 60 gal tank from 1", took about a year to start spawning.
moved 6 pairs to a 400 gal kiddy pool where they would spawn regularly, sometimes only a couple feet apart.
Great fish, can take fairly abrupt temp changes.
When they spawn during and after the rainy season, in only inches of water on the flood plane in Costa Rica, the strong wind sometimes drops water temps significantly.
Over….