You could try angels.
If the fish you are referring to is Mogurnda mogurnda, I wouldn't keep it with anything smaller than half its size. I had one that got to be around 8" long and he made entire cubes of tubifex worms (size of a six-sided dice) disappear in one bite....I also just started leaning toward a purple spot goby/gudgeon, but in that case you could definitely kiss your shrimp goodbye...