I purchased a carpenter wrasse a couple days ago and he's been acting strange. This is my first time with this fish so I don't exactly know what to expect. He hasn't eaten and is always on the sand bed. When he does come out, it seems like he's struggling to swim. Right now, he is on his side on the sand bed up against a rock. It doesn't look like he's going to make it and I really don't know what it could be. Here is a picture from last night and another from right now:

