When I was new to all of this and would go into a LFS, I’d buy a nem bc I liked it. Nem would come with a clown. Ok. I ended up with 3 ocellaris in a 55. Not knowing there was anything wrong with that until years later. Lol. They lived fine like that for 3 years. All 3 living happily in one LTA. And I had 7 other rainbow nems. I’ve since upgraded to a 140 and wanted to try my luck with more clowns. The 3 OG ocellaris, 2 midnights I had in a 35, and 2 skunks. 7 clowns in a 140! The experiment did not work. Haha. The midnights has to go bc they would not leave the ocellaris alone for the LTA. And I had 5 other nems for them to choose from, but they wanted the LTA. But the skunks and ocellaris all live peacefully. There will be a pecking order to see with one will be the boss bc there can only be one, but yes you can successfully have more than 2 clowns