Kels orinos xingu-180 intermedia azuls ocellaris monos Pinima - 240 tems- 4ft wide 400+ ( All personal opinion) although I got all my bass in 400+ Once you upgrade to bigger tanks you won’t be able to imagine them in smaller confinements but it can be done. Good luck man
Well the gallons isnt the most important. Thats the footprint. I have an 425g tank with 244x110cm as footprint. I used to keep 5 orinos ranging from 30 to 45cm in it and i think thats about minimum for that group. You have to take in consideration they get almost 70-75cm long and can get up to high speeds.