black convict cichlid

Hi all, I have what I believe to be a male Convict (see attached photos). He’s only 5cm. Is this too small to tell the sex? Also curious about Convict growth rates. At 5cm how old would mine be and how quickly will he grow to full size? He’s sooo cute and so full of personality. 🥰

I’m moving and can’t take my black convict fish with me because I’m afraid he won’t survive the trip. My brother offered to take him, but we’re not sure if our fish are compatible. Can my black convict share a tank with tiger barbs?