They are fed live food from my pond, surprising how much is still there in winter , plus frozen bloodwormsLovely fish, quite the micro predators. Live daphnia?
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TBH I thought they were males as they are such good colours and frequently display .The posted photos are female
Any males?
Note they are quite the jumpers, be careful of startling them - especially with activity near the tank in the middle of the night
They’re also prone to internal bacterial infections but don’t mind large water changes at all - though they’ll usually hide initially - once settled, expect them to attack the syphon tube
Tank details?
Most S osphromenoides show little colour or activity difference between male/female - though I had one group that was very distinct with mature males displaying extraordinary purples and greens in the fins and body ..... unfortunately this group was also extremely aggressive once the 2-3 females reached breeding age (there were 16 boys so you can likely guess the rest)
Sexing is done by the slight fullness of the throat area (females or males depending upon who’s the mouthbrooder in the species)
Tanks sounds grand and not having to share tank space with tankmates is usually their preference - they really need to be the star for long term success
Most Parosphromenous species should be fine, I’d try to add a couple more Choco’s if possible
They should be quite energetic, enthusiastic eaters (much more so than S vaillanti)