Balashark, Yup, cleaner shrimp are completely reef safe and will do well in a 30g. You could even get two, which IME means they will be more bold as they have to compete with each other a little for food. BTW, there are many shrimp in the "cleaner shrimp" family. Most common are: peppermint, scarlet skunk, fire (or blood), and coral banded. I would recommend all but the coral banded, as they can become aggressive (not hard to believe with the unusually large claws they have for a shrimp). However, when most people refer to a "cleaner shrimp" they are referring to the scarlet skunk, which is the best one of the bunch, IMO. Though the fire shrimp is arguably more beautiful, it is also more timid, so you may not see it as much.