get a 10g tank, my firend has a 10g and a lime green mantis. I saw it feed today, it was soooooo cool! The mantis is only about 3" long, and we fed it a shrimp even bigger than it! It punched it like 3 times, then the shrimp was wounded and was hobling around, then the mantis went for the kill, grabbed the shrimp by the back and pulled it into its home. If it was humans, it would be a horror film! THE coolest thing! you can get one at
Aquarium Fish: Tropical Freshwater Fish and Saltwater Fish for Home Aquariums