He looks like he maybe a blue. As for sex I would lean towards make but really at this stage it could still be either. I don't think anymore can definitely say it is M or F
Maybe it's your lighting, but to me the dorsal looks like it has a very dark area, which usually indicates female. To compare, some photos below of Herichthys carpintus chairel
female
male
many of the Herichthys complex look very silmilar, and it would be difficult for me to differentiate by that pic, below a pair of Herichthys tamasopoensus
Ya guys it appears she has a black spot by the dorsal fin also I have 2 female Convicts that are trying to breed with my male Flowerhorn in a flower pot and she's always up in the mix. Chasing them around and digging in the gravel. Yup in the background its Squidwards house my son wanted it...Here's some better pics.