Tut tut Ulu . I'd have thought the meticulous engineering designer within you would have drew up a detailled computer generated schematical drawing to illustrate how to open up the feed flap in the hood!Good to see that the fish survived your vacation.
The last time that I had a pet sitter to feed my fish she was shoving food inside of the lamp, as she didn’t understand my fancy hood, and could not locate the feeding hole.
The fish in one tank didn’t get fed for four days but they were fine. They all got together and picked somebody to eat while I was gone.
Your poor fish sitter friends didn't stand a chance, they were defeated before you even went away, lol.