So I quarantined my cories for a week (three peppered for Valentine, three Albino for Laborday), and put them into the 20 gallon today. Valentine pecked at one of them once and chased it around, then cornered two of them and eyed them a bit before going on his way and he really doesn't seem to give a crap about them now other then sometimes stopping to watch them eat, probably because he realized there ten times faster them him and his old butt will never catch them lol.
Now Laborday seems to be a little more aggressive. He spent the first couple of minutes chasing them around relentlessly and pecking at them, then he stopped obsessing and just went on his way, stalking them from time to time. I've been watching and sometimes they'll swim past him and he doesn't care, then other moments I've seen him eyeing one and he'll lurch over and nip it and chase it a bit, but then kind of loose interest. He hasn't killed them all day, so I guess that's why I say semi success. But I'm wondering if I should give him more time and see if he gets used to them, or I really just need to remove the cories and save them for my ten gallon in a month?