If you have a strong pod population or other live foods in the tank, the wrasse will eat those as well. Does it look healthy? Is it eating when you feed? Does the stomach always look bloated or does it change size? That wouldn't necessarily mean anthing, as it could be feasting regularly, but might give a clue. I have a blenny that most always looks like she swallowed a marble, but she is always picking at the rocks in addition to feeding.