I don't mind if the shrimp get eaten I'm going to probs breed them for the fish to hunt out and eat
im not sure though I can buy them for 75c each instead of 2.50 dollars each
Pipefish are extremely slow eaters. Even with target feeding it will be out-competed.
Ornate catfish will eat everything in that tank with ease. They have enormous mouths for their size.
South American puffers are a bad idea, they will shred every fishes fins, and eat the shrimp. They sometimes work in fast moving communities, but your cats are easy targets. But they are completely freshwater.