My melanarus has been a perfect tank mate until today! I went a day without feeding and he ate my 2 1/2 inch cleaner shrimp. My fire shrimp look like lobsters, so we will see if he goes after them. Fire shrimp also have pinchers that cleaners don't .... I hope he doesn't go after my giant fire shrimp but it's possible. My melanarus is pushing 5 inches and is fat as can b.... B careful buying melanarus if u have shrimp