I've been working on a dubia colony for roughly nine months, and have had to restart it a few times.
It seems that for me the colony gets going, and is doing well enough (having roughly 2500), and then after feeding for awhile, all of a sudden just stops. I hear that my colony is dwindling again, and if it doesn't pull through again, I'm going to prepare for Lobsters.
If the Lobsters don't work, then I'll be back to Dubia, but meh.