The Aqueon Quietflow 10 does 20gph. Which is fine, but even right now, you need more filtration. I would suggest getting one more cory, because they would feel more better in groups of atleast 4. :)
Here's what aqadvisor says:
Warning: At least 4 x Albino Cory are recommended in a group.
Warning: You NEED to add more aquarium filtration capacity!!!
Your aquarium filtration capacity for above selected species is 69%.
Recommended water change schedule: 29% per week.
Your aquarium stocking level is 74%.