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how do u tell boys from girls in behavior? i have some that like to mouth each other and chase! what does this mean?

Don't feed the Angles for 24 hours and than take a look at them from the front.

Those who have a flat belly are probably males and the fatter are probably females.

Males also usually have a hump on their head.

"Those who have a flat belly are probably males and the fatter are probably females."

Females dont always hold eggs...they're not always that round.

Usually people tell when they are spawning, or the more ounced head of the males. Usually if you observe a pair, you can notice one has a slightly larger head thats more ounced.

I have been told as well that you can tell males from females by the distance between the pectoral fins in the front and the anal fin in the back. Apparently this distance is greater in females than in males, noticeably so if you have 2 side by side. In my breeding pair the differences are: Longer gap from fin to fin in the female, male has a large bump on his forehead, females head is smooth and rounded, female is very plump in the belly, male is very sleek and slim.
Also, if you get a couple angels, and you notice 2 that seem to squabble a bit at first, then hang out a lot together, thats a pretty good sign one is male and one is female. Also, if two decide to start cleaning something, another clear sign. After 2 have paired up it is much easier to judge male from female.


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Both males and females will eventually develop humps. Pete is on the right track with the pectoral distance. However, that still tends to yeild some inaccurate results. By far the best way to sex your angels is shining a light on them, with a piece of cardboard behind the particular fish you desire to sex. If you see a pear shaped organ near the genital region, you have a female, if not, it's a male.

Females vent is oval and it points down and back when exposed, about the size of a piece of white rice. The males vent is very small and round. When exposed it looks like a splinter sticking out and leans forward. This has never failed me yet! Good Luck

The problem with the aforementioned approach is that the majority of the time, the genitalia of the fish is not exposed.