I have cories in my 20 gallon... I started with 3 albino and they weren't really doing much together... 2 would swim together and the third would be off in another part of the tank.
I later added 2 more albino and 3 julii cories - and now - the 5 albinos are really cute together... but the julii are acting as the original 3 albino did - 2 together and one seperate... I will need to add some more julii so that I can have two happy groups.
I will say that the julii swim a lot slower than the albinos do. And, my king betta who shares their tank is more nippy with the juliis than he is with the albinos.
The julii are learning that when the betta approaches, Move outta' the way.
TheJewels... 20 g H plantedsorority - 4 princesses & 3 zebra otos
Ladies of Camelot - extended visit of Rome - 7 pretty girls & 7 cories - 20G Long.
Gawain - hM (2.5 g planted tank)
Lancelot - hM (5 gallon tank)
Roland - CT (5 g)
Galahad - deltatail (15 gallon divided)
King Richard the Lionheart- king betta (12 g Camelot)
Tristan - VT- (15 g divided)
Robin of Locksley (20g H w/threadfins/neons)