I have known wrasse tend to hide when first introduced forever, i have had them hide for weeks before when newly added, but i was even surprised by my newest addition. I picked up this little guy about 2 months ago, he spent a month in qt and when i introduced him to the tank around the first of June i never saw him again. Well, low and behold, he came out and is hanging out with his purple buddy and eating with everyone tonight. So, never give up on a hiding wrasse, they will surprise you. (sorry for horrible pic, they are quick swimmers)