How do fish get in overflow? Over or through?

[bubba60tackle]

I have a 5 year old clown that has gotten in my overflow 3 times now. Tank is an Aqueon 210 with dual over flows. I have glass tops on it. I want to do something to stop this from happening but is he squeezing through the grate? Or somehow managing to jump and make it between the 1/2” gap between the glass tops and the top of the overflow? Any thoughts on how they typically get back there? Both seem almost impossible.

 

[Dread Pirate Dave]

Hard to say but my first guess was going over the top. You can try these, perhaps.
https://www.etsy.com/listing/1254719762/mega-overflow-lid-aqueon-oceanic