Thank you for the info and trying to post more. This really is the best community out thereI think I've said it before but it's nice to see you posting from time to time Charney . I have very limited experience, but I have kept a Silver with a Lei and didn't see aggression. While not exactly a group it was also in a smaller tank than you're proposing, and I imagine a group would also help disperse any aggression. I imagine the same would go for a Black as it did with the Silver and the Lei. Both were rehomed before reaching adult size though so I can't speak of lonterm.
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Working on being more involved…..