I know, I know, peppermint shrimp, cleaner shrimp, and fire shrimp are all "reef safe." For most people, this is true. Here is what they don't tell you - they are reef safe if you have only a few. I frequent my LFS a lot and they told me a story about when they first started up. They bought 500 peppermint shrimp and put them in their coral tanks for display and sale. Their tanks are large but admittedly, that's a lot of freaking shrimp to put in one place. The result? The next day they found the 500 shrimp ate $3,000 worth of coral. Admittedly, this is definitely an "outlier" but if you put too many shrimp in an area, they get hungry. They are "reef safe" but I wouldn't put more than 2 shrimp per 50 gal if you have coral. Same goes for the others. Put too much in and they will eat whatever they can to survive. Also, one thing to consider if you have LPS hard corals and you want to feed them directly (especially the bubble coral!) - be extra careful with shrimp! They will eventually learn that LPS corals = easy to steal food and can irritate the heck out of the coral. Because of my fire shrimp, I had to re arrange my corals to keep the bubble coral far away from "his territory." He was not eating it, simply touching it so many times it hardly opened its polyps. Sucks, I know. I love shrimp! I am considering using a spare 29 G tank I have as a shrimp only tank.