Too many bottomfeeders?

I cant see an issue. Corys are peaceful by nature they just spend all day scurrying around looking for food. The loaches will be fine too although they will grow a lot bigger than the corys I doubt you'll have any issue. tbh I wouldn't bother with the algae wafers, crumb style food is better. The corys are hilarious though when they swim about with a bloodworm hanging from their mouth.