I am pretty sure it is a species of Cyclocheilichthys, all if not most getting big, i think my first guess at Apogon was wrong, as pointed out, the dorsal fin is wrong, I am slowling going through all the species of Cyclocheilichthys and have found another and closer match....
Cyclocheilichthys repasson
http
/www.google.co.uk/search?tbm=isch&hl=en&source=hp&biw=968&bih=539&q=Cyclocheilichthys+heteronema&gbv=2&oq=Cyclocheilichthys+heteronema&aq=f&aqi=&aql=&gs_sm=e&gs_upl=2636l2636l0l3569l1l1l0l0l0l0l120l120l0.1l1l0#hl=en&gbv=2&tbm=isch&sa=1&q=Cyclocheilichthys+repasson&oq=Cyclocheilichthys+repasson&aq=f&aqi=&aql=&gs_sm=e&gs_upl=14376l33803l0l34432l3l3l0l1l1l0l209l382l0.1.1l2l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=eb793a8d0909492f&biw=968&bih=539
They keep lumping all the species of Cyclocheilichthys onto the google images page but look at the first pics as they are the closest match to the name i put in...
Yours is most likely a male, whatever species as its not very deep in the body...
Cyclocheilichthys repasson
http
/www.google.co.uk/search?tbm=isch&hl=en&source=hp&biw=968&bih=539&q=Cyclocheilichthys+heteronema&gbv=2&oq=Cyclocheilichthys+heteronema&aq=f&aqi=&aql=&gs_sm=e&gs_upl=2636l2636l0l3569l1l1l0l0l0l0l120l120l0.1l1l0#hl=en&gbv=2&tbm=isch&sa=1&q=Cyclocheilichthys+repasson&oq=Cyclocheilichthys+repasson&aq=f&aqi=&aql=&gs_sm=e&gs_upl=14376l33803l0l34432l3l3l0l1l1l0l209l382l0.1.1l2l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=eb793a8d0909492f&biw=968&bih=539They keep lumping all the species of Cyclocheilichthys onto the google images page but look at the first pics as they are the closest match to the name i put in...
Yours is most likely a male, whatever species as its not very deep in the body...
One of the ones i took a guess at earlier...







