Peter99, do you feed your corys the shrimp pellets after the lights are out? If I don't do it this way, the tetras are little pigs and hog them away from everyone else.
When the lights are out, I push the shrimp pellets to the bottom. Sometimes the tetras will follow them down but lose interest because I think they can't see them very well.
At least I hope the corys are getting some food. They must be because the one is getting really big (think it's a female) and the other little one is catching up fast. They are very active and really goofy sometimes. Cute little guys, aren't they?