Mandarin Dragonet - Male - Needs help ASAP

[EmilyB]

As many of you know I have had mouse for several years and he was a fatty. Over the last little while I had noticed him losing weight, but what I saw today was a shocker. His poor belly is all pinched and I fear I am losing him.

I removed most of my sandbed recently and fear this is the problem. Although I have lots of pods, most of the sand worms are gone.

Does anyone have a good mandarin environment that could take him asap ? It may already be too late, I don't know. I feel so bad for leaving him this long without noticing.