All fishes are easy if you can provide the care and food that they needed.
The common Leopard Wrasse,
M. meleagris (and most of the Leopards) needs are:
Good clean stable water
Fine sand bed of at least 1 inch or so or deeper
No other fish that bother them so they can feel comfortable
They are delicate shipper so healthy reasonable fat fish is needed
QT in natural setting, preferable in a reef tank with plenty of Fauna and Flora so they can pick on and eat while you can get them to get use to captivity food.
Perhaps a dither fish, that are non aggressive and feeding well, in the QT tank that get them excited and eating.
Providing the above I rarely have problem with getting my Leopard to eat. Once they are eating well, they are relatively easy and problem free to keep. I never have treat any of my Leopards for any disease or parasites.
Below are pictures of my Male Meleagris Leopard (nuptial coloration and normal coloration), female, and video of my two recent acquisition, two tiny Meleagris Leopard that are 1.25 and 1.5 inches in lenght. I got both eating pellets with gusto, getting fat and growing fast.
Also several pictures of my Black Leopard male, normal coloration and nuptial coloration, and my female Black Leopard
Both of my Black and Meleagris Leopard males I had for 3+ years, and both started out as 1.5 inches or so juveniles in my DT. Both grew and change to terminal males in my tank.
Meleagris male nuptial coloration
Meleagris male Normal coloration
Meleagris Leopard Females
Video of my baby Meleagris Leopards
Black Leopard male, normal coloration
Nuptial coloration
Getting excited
Female Black Leopard