An update:
I’ve had the fish about 5 weeks now. I lost one fish of the six after a couple of weeks. I have now prepared an existing tank especially for the remaining five, it’s 100L and is decked out with seedpods, leaves and branches. Very soft water with tannins, and in a quiet location. Floating plants are starting to cover the surface.
The fish went in yesterday morning and seem to have settled. I have seen all five swimming around and taken some photos, though conditions are difficult for photography owing to low light and tannins. One of the photos shows all five fish together. Two fish still look very thin but they are active.
Behaviour-wise, there is clearly a dominant male that is longer and fatter than the rest. He has long pectoral fins and a rhomboid (slightly pointed) shape to the caudal fin. The edges of the fins have a fine electric blue line, but otherwise the fins seem clear.
He is often seen interacting with two of the other fish, including what may be a reasonably healthy female, plus one of the thin ones. The remaining two fish usually hang out on their own, but occasionally join the group.
I am offering daphnia, moina, grindalworms and newly hatched artemia.
I hope they will continue to improve in condition.
Can we confirm the species?
Best Regards,
Paul