What are you using for such a cheap top? I'm setting up my first tank and currently don't have a top. I'm assuming this is just some basic hardware store stuff. Any chance you could link the product so I can go look for it? Those fancy custom tops are expensive and I could probably get by with a simple little rectangle in front of my AIO back chamber area (whatever that's called!) to just keep the fish from jumping out.
Related but slightly off topic anyone have thoughts on if those little feeding ports are worthwhile/easy to install? Taking the top off to feed seems easy enough, but they make them, so maybe that gets more annoying/problematic than I think? Maybe someone invented a problem because they had a solution?