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It depends male bristlenoses can be territorial over hiding spots but since the clown was introduced first then it should be alright as long as you have a good amount of hiding spots
It's should be fine in my 75g I have 6 gibbicept plecos, 1 gold spot pleco and 2 synodontis catfish and I don't get any of my catfish fighting. Also in my 33g I have 4 gibbicept plecos and I don't get any fish. So it should be fine.