Planted Tank Enthusiast
Join Date: Jul 2014
Location: California for school, Arkansas for home
CPD TANK!!!!! Following the rather detailed description of the Celestial Pearl Danio environment (the PDF is somewhere on the internet), you can have schools of both CPD's, rosy loaches (Yunnanilus sp. 'Rosy'), and Devario sondhii. If you plan accordingly, schools of 10 fish each seems feasible. Plant with Elodea, Egeria, Blyxa, and other plants. All the fish are relatively small, and they all seem to hail from the same environment as well, fulfilling your asking for a biotope.
So many fish to keep, not enough aquaria.