Nice pics & tank!

A couple of unsolicited suggestions...

1.) Get a small flat rock to get your wellsophyllia up of the sandbed a little bit. He'll do much better if he isn't always getting sand on him.
2.) What are you feeding your convict tang? He is really skinny. I've noticed that they seem to need lots & lots of vegetable matter (seaweed selects) and if they are eating alot of stuff like brine shrimp & mysis they tend to just keep losing weight. Also I dewormed mine using live brine shrimp gut loaded with praziquantel, he seems to keep weight on a little easier now.