Azoo 9 in 1 Micro Pellet.You can feed lots of them without much trouble.
I don't know about corys since they are very shy to swim to the surface for food,maybe before the food reaches the bottom other fish already gobble them up.
80 g, Eheim Pro II w Hagen Surface Skimmer, TetraTec IN-1000, JBL Aquabasis and Sand subtrate,
1st 40w Lighting: 40W Marine Glo
2nd 80w Lighting: 2 40W Power Glo
3rd 80w Lighting: 2 40W Aqua Glo
Whole set of Azoo fertilizers
3.8 kg Pressurized co2 tank