I bought some Eheim auto feeders for while i'm on vacation. I don't want to cut holes in my hoods for the feeders, so I have to open the lid to use the feeder. I have fish that jump though, and all the "open" space needs to be covered. My idea was to cut cardboard to size, cover it in packaging tape, and tape it down so fish can't knock it loose. I'm sure my idea will work, but I was wondering if anyone had any better ideas.