Adults do not guard the eggs. The number of eggs is relatively small (several tens per spawn from one female). The optimal water chemistry for the development of eggs varies from author to author and it may thus depend on the origin of the fish population.
It's the adults that don't look after the eggs. The quantity of eggs is relatively small, with several tens spawned from a single female. The optimal water conditions for egg development differ among experts and can be influenced by the source of the fish population.