Minimum size to accurately sex Green Terrors? (Without venting them)

[neutrino]

I agree with most of the above. But at least ime, with the individual variation of those I've had, the facial markings weren't always foolproof. Not that I'm disagreeing with anyone, since it could easily be variation between breeding strains or individuals.

But, definitely, adult males are clearly larger, showier, and a different head profile with any I've had. To me it's similar to other species (including a lot of African species, some of the geos I've had, etc.) where juvies look female-ish until the males start to develop their male characteristics, including-- at least ime-- developing more of the wormy markings on the face.

 

[tiger15]

The following are pics of 2 pairs of GT that can help you sex them. All 4 fish are raised from the same batch about 2 year ago. The males (8 inch) are twice as big as the females (4.5 inch), but the size and color differences don't become obvious until they reach sexual maturity at about 4 inch.

The top 2 pics are a female and a pair in non-breeding color. Note that the female in non-breeding color is nearly as bright as the male and could be mistaken as a male if kept alone. The bottom 2 pics are a different female and a pair in breeding color. Note that the female is lot darker.

 

[BassetsForBrown]

Actually when closer to full maturity, the males are quite a bit more colorful in the body and fins. The orange banding is usually quite a bit wider and more vivid in color. The 'pearl' scales on the male run in solid rows and the fins are larger and more colorful. You can't mistake a male for a female (and vice-versa) once they reach maturity. And the males are much larger than females of the same age. The females have considerably less spangling on the body. Here are some pics for comparison. Notice the absence of spangling on the body, her darker coloration. and the faint vertical white bars on either side of the central spot.

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male

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female

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female

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pair

Thanks, gorgeous male, and those plants look very nice for being artificial.