Spare 20x20x30 tank

Hi everyone, just looking for some recommendations for a 20x20x30L tank. I know it’s quite small but I was wondering if there’s anything that can comfortably live in it. The tank was £35 so that’s why i’m keeping it 😅😅 I originally had 2 Indian stick insects in it but they’ve been upgraded to a 30x30x60 tank so there living the dream lol!