Its male Anampses Chrysocephalus . One of my most favorite fishes and I have a female along with other Macropharyngodon and Halichoeres .
Its care is the same as other Macropharyngodon species . Definitely needs a sand bed , frequent feeding is better . I feed my acro dominated tank like 4-5 times a day and replenish pods in it every 2 months which keeps them healthy and fat .
Its difficult to get them to eat at first and live BBS , pods , blackworms might be necessary. Ofcoarse everything goes in main tank after strict quarantine of 45-60 days . These generally suffer from internal parasites and hence qt is must and also allows them to get fatter and get accustomed to your food once in qt for 45 days .
Overall difficult compared to fairies and flashers but to me all the effort is worth the beauty .
Lastly, I have found that Anampses, Macrophryngdons do well at lower temparatures like 75-76 . I run my tank now at 76 although with halides things get really difficult to control !
@eatbreakfast can give you wayy better pointers than I do ! I must have missed some .
Regards,
Abhishek