I searched every local fish store and several not so local ones and have yet to find any hoplosternum cats. I was at Petco the other day, and they had a sale on black skirt tetras so I introduced five more. It still feels sort of empty and my green terror is still rather shy, but I have to admit, it does add more activity to the tank.
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Get more of the tetras so you can have a decent sized school.
Nice tank btw.