Oh yeah I got some of them They're in a tank the same as the one you describe.. I have 2 kadango males (1 10cm one smaller) a big pair of OB peacocks heaps of zebras, lithobates, yellows, demasoni etc etc and nobody bothers them at all.
As for what they are, they look like and im hoping they will be red shouldered peacocks as im looking for some females for the 2 lonely males we have..
Good luck and let everyone know how you get on