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I have one in a 45 Gal. with a Blue Spotted Puffer, The puffer doesn't bother him at all, their both very peaceful, but as was mentioned make sure you have plenty of live rock and small critters for him to feed on, mine will even go after brine shrimp every now and again. They're absolutely gorgeous and have a really interesting way of moving about, I'd recommend one given that your puffers are not aggressive and it has a means of feeding