hey there you are! haha
yea i've heard of many people keeping a bunch of them even in a smaller tank like that.
idk this is a tough one, i'd almost be inclined to go with curiosity's advice, just to ensure that everyone has room on the bottom, because your tank doesn't have much space on the bottom probably, and you should up the numbers of corys
orrr...maybe you could take back the cory's, and just get a bunch of khuli's, then not worry about it at all.