Reaching For The Stars (Starfish) We had a green brittle star that died.  We thought perhaps it was that our floating salt thermometer was not working correctly, it showed a normal range but when we bought a gravity tester it showed 1.029.  So we added to the tank more water and now we are at 1.023.  All other tests look good, temp. at 78.  Bought a new brittle star, only in tank 1 night and looks distressed.  Legs curled up around body, they have not fallen off?  Any ideas on what may be occurring.  We are new to this. Thanks for any help. Sherry and Larry <Well, guys- Sea Stars in general, tend to contract fungal and bacterial diseases, often as a result of improper handling somewhere in the chain of custody from the reef to the hobbyist. In my opinion, it would be best to quarantine starfish just like you would fishes, prior to their introduction to the aquarium. You could use over-the-counter (aquarium store counter, that is!) antibiotic medications to treat these infections. Also, provide very stable, high-quality water conditions for these animals, and they can thrive. An often-overlooked aspect of starfish husbandry is selection. A healthy starfish should be rigid, and reactive to stimuli. And, of course, they really should have all of their arms! Look for any body damage, too. Another great test for a healthy star is to flip it upside down gently. A healthy animal will try to turn itself upright quickly. Do a complete review of your tank's water parameters, and pay careful attention to your husbandry techniques (water changes, protein skimming, etc. and you should be successful in the future with these animals! Maybe you should order a copy of "Reef Invertebrates" by Anthony, Bob, and Steven Pro...should provide lots of good information!. Take care- Regards, Scott F>