Crazy fish

[Aquaria]

So my sixline wrasse started (4days ago) acting funny. He's been spending his whole days attacking his reflection and eating next to nothing he's a fat fish but seems to be losing some weight. breathing seems faster then normal and no other visual indicators as to him being sick. tank is a year in nov and perams are normal although nitrates were high before my last couple of WC and if it helps my Duncan has been receding with a yellow string substance all around the polyps where the receding is happening although I was pretty sure(before my wrasse started going crazy) that is was because I needed new bulbs as mine are stock bulbs over a year old.