Tango's started chasing the corys a lot more recently. He doesn't wound them or bite them, he just chases for maybe 2-5 seconds and then goes about his business. The corys seem to know the difference too. I've seen them all laying around together and Tango is among them on the gravel. I've seen him cruise right up to them and they don't flinch. But sometimes it's like watching Benny Hill and the corys seem to know when to take off.
Watch for wounds and such. I check my corys daily just to make sure nothing hinky's going on when I'm not watching.