Is it dangerous to shrimps? Yes.
Now, if you ask how dangerous, that's another question. And one you'll get lots of different answers to. If your primary concern in that tank is the shrimp, I'd avoid any food that uses a copper-based preservative even in tiny amounts. Copper is toxic to shrimp and it bioaccumulates. What that means is, it's not like if one piece of this food goes in the tank the shrimp are going to start having seizures and dropping. Even if they are eating the food regularly, they will probably be fine for 3 months, 6 months, 9 months...who knows. But then one day, you're going to come back to these forums and start a thread saying, "My shrimp are dying for no reason! I checked my water parameters and they're perfectly fine!"
Now, that actually may or may not happen. If most of the food is eaten by your fish, and eaten quickly, then it could be that the shrimp uptake copper so slowly that they naturally live out their lifespan (which, let's face it, is rather short) before they've bioaccumulated enough copper to be toxic. So you potentially could use it safely, I suppose. But at the very least, you're taking a big risk.
Now, if you ask how dangerous, that's another question. And one you'll get lots of different answers to. If your primary concern in that tank is the shrimp, I'd avoid any food that uses a copper-based preservative even in tiny amounts. Copper is toxic to shrimp and it bioaccumulates. What that means is, it's not like if one piece of this food goes in the tank the shrimp are going to start having seizures and dropping. Even if they are eating the food regularly, they will probably be fine for 3 months, 6 months, 9 months...who knows. But then one day, you're going to come back to these forums and start a thread saying, "My shrimp are dying for no reason! I checked my water parameters and they're perfectly fine!"
Now, that actually may or may not happen. If most of the food is eaten by your fish, and eaten quickly, then it could be that the shrimp uptake copper so slowly that they naturally live out their lifespan (which, let's face it, is rather short) before they've bioaccumulated enough copper to be toxic. So you potentially could use it safely, I suppose. But at the very least, you're taking a big risk.
