I have a new-ish 75g setup with a snowflake eel, striped burrfish, and a small red-spotted hawkfish. I notice that after feeding time for my eel and puffer, there's always some little scraps that sink to the bottom and just sit there. Are there any predator-safe fish I can add to the tank that'll maybe clean some of those leftovers up? Or any invertebrates that will be safer than others with the eel and puffer? I know most shrimp and crabs are a no-go. Thanks for any help!