feeding cory and plecos

Hello I have a 20gallon tank with: 4 corydoras aeneus 7 guppy 2 platy 3 upside down catfish And I noticed a problem while feeding. The guppys and platys are always eating the food of my corys. To help the corys I try to distract the others with flake food on one side of the tank while I sneak...

I am hoping someone could help me with a feeding plan for these guys.   I have 2 ten gallon tanks. Besides a few other fish -   Tank 1  - A Pleco and a peppered Cory. Tank 2  - A Pleco and a Bamboo Shrimp (which is really neat to watch)   Morning, both tanks gets fish flakes.  ...