Whoa...I would be very careful about tankmates!
Cories are soical fish (believe it or not lol) and need to be in groups of no less than 5, unless you have more than 1 species, then groups no less than 3. Most cory schools will be 100% of the stock for a 10g just by themselves. Pygmy cories are small, and you can fit a nice school in a 5g tank, but they could be killed by the females. I do not recommend ANY type of cory in a small sorority.
Alot of people don't think that the miniature plecos (BN, RL) should be kept in a 10g, because it doesn't allow much space to swim on the bottom. Alot of people think it is Ok because of their relatively small size. I don't have an opinion on that matter. I guess that is your decision.
That is all I have to say about tankmates.
Good luck with your sorority!