Agree, it's Cr. sp. "Bellycrawler"
Want to know it's sex? If female, the soft portion of the dorsal and anal fins will be clear. In males these areas are heavily spotted. Females will also frequently have an oceli in the middle of their dorsal fin. As they mature this becomes more distinct. When ripe females will exhibit a scarlet red strip along their abdomen and along the back. Quite pretty actually.