I'm in the U.S. and am interested in keeping the larger variety of springtails. Found some neat videos on them. I'm also keeping the regular small species that we often seen like the tropic pinks. But I've seen some really large springtails, still small but a lot bigger than the ones we have. Anyone know why they're not as popular to keep and if they're even sold? I love watching the small ones so I thought the big ones would be really great to see.