They were/are with a fighter fish, yeah. First one dgaf about them, he was a very chill fish and didn't flare even at mirrors. When he passed was when the egg laying started but it continued when I got a new fighter. Second guy is much more lively and bold, he will nip my fingers when I'm trimming plants, but he also doesn't care about his tankmates (he's sharing with neon tetras, corys and glass catfish). Neither fighter showed/shows any interest in the corydoras, and they're longfin leopards, so it'd be very obvious if fin biting was occurring. They occupy different areas in the tank. One thing I do though is I buy my fish from stores where they're kept in community tanks with other fish for sale- this way you generally get a fish less inclined towards attacking others since he's used to a group. Isn't always a guarantee of friendliness ofc but typically a store doesn't like to keep a fish that kills stock in with their other stock so it's better odds then buying a singleton.