They can be kept in groups. I'd go with three. Choose two small specimens and one larger one. With plenty of rockwork, they will likely go their separate ways, but not pester each other. Add them all at the same time.
I had three in my 75g. I added them all at the same time, one large and two small. The larger of the small ones started chasing the smallest and I had to pull out the little guy.
The other two show no aggression and are starting to show some signs of courtship.
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