It can be? Thats the best answer I can give you. In my 150 gallon, I have three generations, but they are all from the same descendent parents. Plus, 150 gallons is a lot more space than 30 gallons. I never see my brichardi fight with each other, so the best thing I could say to try is to start with a pair, then let them have their way with each other. If you get a ew more adults in there with no problems then all is well, but if you start to see some conspefic aggression, then get rid of the new adults. Trial and error, trial and error.The only thing with them is that I would like to keep more than two adults. Is that possible?