Yeah, that's normal. I would HIGHLY recommend soaking the F.D. krill in water(from the tank) for 5-10 minutes before feeding, allowing to swell and expand first. Sometimes the fish gobbles up the krill too quickly and the krill will swell in the stomach of the fish, potentially causing bloat or other major internal damage. I've seen it happen! I believe this is far more important with small fish as opposed to larger fish with bigger stomachs.