Well, I wanted to add another cory to my tank (I now have 3) but in every fish/pet store I go lately I see HUGE corydoras.. and by huge I mean 3.5 inch long and extremely fat like they are on proteins or something. My corys I have for 2 years now are about 1.5inch long and they didn't grow since I bought them. They are 2 bronze and 1 albino. Will my corys grow to that size? Is this normal?