As said above, Herichthys mate in compatible pairs, but just because one has a male and female, doesn't mean they will be compatible.
Females will often batter other females in the tank, and spawning males will usually try killing all others.
My pair of Herichthys carpintus "Loc "Chairel" with a spawn

Below Herichthys tamasopoensus spawning.

In both cases above, I started out with 6 to 8 individuals of each species. and allowed them to select compatible partners from within the groups.
They they separated themselves from the group and attacked any others that came close. I would then remove all others, or divide the tank, if it was large enough.
Females will often batter other females in the tank, and spawning males will usually try killing all others.
My pair of Herichthys carpintus "Loc "Chairel" with a spawn

Below Herichthys tamasopoensus spawning.

In both cases above, I started out with 6 to 8 individuals of each species. and allowed them to select compatible partners from within the groups.
They they separated themselves from the group and attacked any others that came close. I would then remove all others, or divide the tank, if it was large enough.
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