The Demasoni are much smaller, but I'll put them up against just about anything honestly. Most of the aggression is conspecific, so anything that looks like them is screwed. They don't even notice the labs unless one is in their chosen cave.
Interestingly enough, I started with a group of 17 and for whatever reason, wether shipping or husbandry issues, the group shrank down to 5 .......2 males and 3 females......doom...... or so I thought
Now, I'm back up to 13 with 4 females currently holding. There are 2 dominant males, 1 on each side of the tank and they wont stop breeding. I've probably pulled 30 in the last 3 months and now are the only fish I DONT pull each month. They will now punk anything in the tank, but the sheer size difference seems to keep them at bay as some of the fish are 6" plus
They are pretty tough to sex, but places like Cichlid express are pretty good at doing it and even though I thought the group was doomed, they are now breeding out of control lol
Lighting is a Current 36 Compact Flo 10K/actinic in the center with a 48" T-8 natural daylight behind and 2 18" T-12 natural daylight on the sides