they wiil stick together and beat the daylights out of everything that comes near them. if those are the ones i just gave you give em some time. they just spawned 2 weeks ago.
They'll stick together, and you'll probably notice they start digging pits in the substrate. The female will also colour up very brightly, and males usually get a bit of colour (blue/greens) to their fins. Then, before you know it, you'll see a little batch of eggs that they guard intensely.