Did you know fantastic help is an anagram of Planet Catfish? This forum is for those of you with pictures of your catfish who are looking for help identifying them. There are many here to help and a firm ID is the first step towards keeping your catfish in the best conditions.
You probably need to wait until the fish gets a bit bigger - sexing P. maccus is based on "hair" over the back of the body, which appears on the male when he's mature enough to spawn, around 7 cm TL.