Sexual dimorphism is present, though limited in this species. Males are generally larger, (up to 15 cm), than females, have brighter and more red colouration around the throat, and have more pointed dorsal and anal fins.
Firemouths at about 7 cm the dimorphism becomes apparent. T. meeki spawns like many other cichlids, forming mated pairs at about a year old and laying eggs in a cave. They need lots of hiding places. The photo shows very pointed anal and dorsal fins i.e. male.
I'd like them to pair themself and I'll keep only a pair. Now they're about 6-7cm, and I'm afraid there is no male Only one fish could be "him", and pics you can see at the beggining posted by Peter show that fish. This is the biggest one within the others, has longest fins and is the most agressive and terriotorial. John gives me some hope (thanks a lot ), but maybe this will help to asure me :
My largest Firemouth is about 8 cm and has been busy improving a cave. Probably a female and has excavated the gravel down to the glass. Difficult to photograph but I should get a lucky shot soon. She has very little colour compared to the males.