My Red Sea Star, Fromia milleporella I think, has been losing his legs since I put him in my 40g seahorse/invert tank. I have seen sea stars legs deteriorate like his and then grow back after a little while, but his are not growing back. It started with 1 leg then 2 and now 3. None of the legs are completely gone, their just nubs now. There is plenty of live rock and food to go around. I have two brittle stars in the same tank and they are not having any trouble. What causes this in sea stars, and what can I do?? pH 8.4, alk
0, nitrite 0, nitrate undetectable.