tank lid

Hey guys, just wondering if anyone has had this problem before and what they did to fix it, I can’t seem to remove the remaining ‘set’ at all as it’s built into the tank. One of my flatmates suggested magnetic strips, Would that be okay with getting wet sometimes and safe for the fish? Lid...

So I had a betta jump out of his tank today. His name was Spangle and he was a Half-moon King. I found him when I got home from work. It looked like the tank lid had been shoved over a bit, probably by my dog bumping into the tank stand. I had a kind of DIY lid on it, just a piece of plexiglass...