It's mouth is always large whether or not it's 4 inches or a foot long. At all sizes, it will pick off community fish, or attack certain types of fish at night. All knifefish are strictly predators, with unusual eyes and an electrical "pulse" to seek out fish during the day, and at night. It isn't really a community fish to begin with.
Like said, ghost knifefish do grow slow, but even so, it's unethical to keep them in small tanks.
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