Just paranoid, however, Mimius hasn't eaten for two days now and is becoming very secretive - hiding more and more. Refused lobster and a live fiddler crab, that can't be good. I can't see into its den (it has a few scattered about the tank) to check for eggs, however, I'm pretty worried. If Mimius is indeed O , then it was pretty much adult size when I got it. Head is about 3" long, mantle about 6" across and arms over 18" in length. I checked water parameters and the pH is 8.1, alk is 7, salinity is 1.026, temp is 77.8. I am going to do a 40% water change tonight just in case. I fear though that this is not a good sign. There is no outward explanation such as injuries or the like to explain his lack of appetite. I have had Mimius for three months now, I just hope senescence isn't the explanation as myself and my whole family are very attached to the little sucker, much more so than any fish, clam or coral I ever owned.