Hi,
Here are my dario dario.
It's a percoid and not really an anabantoid. It's very little fish (about 2cm). They only eat live food. I give them mosquito larvas, daphnias, copepodes and so on. They are 3 in a 40 L tank, with a lot of plants (anubias, moss, hydrocotyle, lilaeopsis, eleocharis...) and a lot of hiding places and a lot of oak leaves.
Sandy soil.
No filter, just a water pump with a very slow flow.
Natural light but 11 w lighting added during winter.
Same thing for heater (they can tolerate 15°C to 28°C, rather prefer 24-26C)
View from the left side of the tank