I just got a Petco 10-gallon glass tank for free, so I'm thinking of doing a little beetle keeping. I love entomology, and I'm an antkeeper, but beetle keeping is new to me. Can I get some recommendations for a cheap, relatively small beetle species that's around half an inch, colorful, has cool patterns, and is fascinating to watch? I'd also prefer for them not to have to eat any animal prey, and that their population will self-replenish, but not explode so much that the tank is crowded. Thank you!