Probably would be fine. That's a good amount a room plus if you add some other fish to the mix it should work. I never had leichardti but I would imagine they are just as ruthless as jars as they get bigger. Might have problems as they start reaching upwards of 12"
I have a Lei that's about 18" now. No agression problems with his tank mates other than the Mbu that bit a piece of a pectoral fin off. He is hand fed and begs like a dog. I would be worried about 3 together past a foot.
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