Worried about my serpent star

[nanodude]

Hello, I have a 24G Nanocube,established now for a little over a year. It has many very cool creatures such as all types of hermits(even a purple one!),pair of clown fish, Dotty(my dottyback)two pygmy gobies(very cool&small),brittle star(not the green one)a few lettuces,snails(Nassarius&turbo,even orange turbos!)but my question is about my serpent star...he is a grey,fancy banded serpent star. Normally he "runs"out when I feed the tank...I mean crazy run. But lately he won't eat...anything. He won't come out to play, nothing. So, I tracked him down and put him in the refugium(in tank)to try and feed him...still nothing. Any thoughts?

 

[kiddie lala]

I'm no expert but you may want to check your water quality. Also you might be over feeding it. Thats probably why its not eating.

 

[nanodude]

I just checked water as I do every Sunday and it's right where it should be. I checked for everything including copper and magnesium. I don't think he is overfed, his body is very thin, almost sunken in...usually he's puffer and more mobile. He hasn't come out "to play" in weeks...Will keep trying! Thanks~