Algae discs alone will not satisfy Cories...they need some meat in their diet as well. There are special pellets made by Tetra that are used for bottom-dwellers. I'd put a few more Cories in there...they do best in shoals (4-6+)
Albinos usually stay between 1.5-2 inches, a bit smaller than their bronze cousins.
While for most cories, the schoaling advice is right on, albinos have largely lost this trait. They don't seem to benefit from larger groups, nor suffer from being solitary. JME.