Many people will tell you that BGKs each have a different personality. My 7 inch ghost plays nice with everything in my tank including my neon tetras but others will tell you that theirs are aggressive towards fish that are smaller.
Generally they go well with other semi-aggressive fish.
I've always been told they're very shy and skittish. I would recommend going for large fish like hatchetfish and silver dollars and angelfish to make sure no one gets eaten
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I may be a little TOO obsessed with my angels...