I have an Orchid Dottyback (Pseudochromis fridmani) which happily shares a tank with a pair of false perculas two Red Striped Cleaner Shrimp and two Peppermint Shrimp. This is a burrowing fish, so to be happy he wants about an inch of substrate to burrow in, as well as caves in the live rock. If his tankmates get too close to his favorite cave, he will chase them out, but that is the most aggressive he has been. I have also kept the Striped Dottyback with many other types of fishes, with no problems at all. I have heard reports of the Strawberry Dottyback actually killing other fish, but I have not kept this species and so cannot personally attest to this.