Well, i currently running a 300g(10x2x2)
Residents are(since July11):
Male Lyonsi 9"
Female Lyonsi 6.5"
2 Female Cutteri 3.5"
1 Male Cutteri 4"
3 T. Pasiones 4"(2M 1F)
3 Robertsoni 4.5"(2M 1F)
1 Sajica 2"
1 Panamensis
The only aggression is really between the Robertsoni which i expected but its also minimal. The tank is quite peaceful. I used to keep almost all parachromis but was only a time bomb waiting to explode. The all male thing sounds good in theory but at the end of the day someone has to be alpha and someone has to challenge. Never again for me. I wanted my tank to have a nice mixture of cichlids and be peaceful. So far i've accomplished that. My cutteri have gone to their breeding dress so maybe they'll spawn soon, then I'll see how aggressive they get with the rest of the crew.
What strain of cutteri do you have? I had a pair in my 125 with other fish that would spawn constantly... Only problem was when the fry would inevitably get picked off the male would blame the female and tear her up a bit... All would be fine a day or two later and they'd go right back to breeding. They were fearless on defending the breeding site but never damaged other fish, just a quick chase.