I love my cories, I have 2 julii and 2 pandas, my julii I have had for almost a year and are maybe about an inch and a half, but no bigger, and have not grown in a while. To be honest, mine don't seem to eat lol! I give them algae wafers, but they ignore them, they must eat, but this also means I have no idea how much they poop, and so no idea on bioload! They do best in bigger groups, if you have the space, go for 6. I think in your tank (if it is the one in your profile) you could get away with 6...
I got 6 cories I'm going to get some more in a weeks time. They have been in just over 24 hours and at getting on really well they've been eating and I'm already thinking they are my favorites, they are just so busy.
The one question I have is 5 of them have a solid line running down thier flanks and 1 of them has spots, just wondered if they will join up or stay spotted?
Many Julli corys are often mis labelled and are actually Trilineatus corys,which is a false julli,they're still lush cories,i now have 21 of these(off spring from them breeding)-i started with 7 ! - True julli are quite rare to get hold of,and the difference between the 2 is julli have spots as opposed to squiggly lines like the tri's.
Good luck with your newbies.