I don't think any technique on sexing them is set in stone, and it isn't blatantly obvious. Things like males heads tend to hump up, and females tend to be more rounded, things like that. There will always be one that does not fit the profile. Laying eggs is a definite.:lol:
There is no sure way to tell until they breed and you can see the breeding tubes. The female's is wider and blunter, the male's being more pointed.
Ime, the female is usually a bit smaller and sometimes the males will develop a hump on it's head. When the female is full of eggs, looking at her head on, her belly will appear rounder. I've seen also sometimes there is more of a distance between the pelvic/ventral fins and anal fin. In some cases the male's dorsal fin will form a straighter angle.
But absolutely no sure way until you see them breeding, even the most experienced angelfish aquarist will tell you. I have bred angelfish many times, many pairs, but I still don't always know for sure, just an idea.
If they are getting along that's a good sign, they are still very young, but I have seen things get violent when two are not compatible. What size of tank do you have them in?
The best way to get a pair is to purchase 6 to 12 specimens and watch them until they pair up. You will notice two specific angels staying together and pushing the others away to the other side of the tank. This won't happen right away, usually when they hit the 7 month range or so. If your tank is 30g though, it will be too small for more, so if they get along, you've done well.
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