I just purchased 2.2 R. acuminatus from Gekko Corner, who was advertising on Kingsnake, and now I have a total of 3.3. Very pleased with shipping and condition of the animals which I received from Gekko Corner. They arrived healthy and look great. Strangely, both males are juveniles, and both females are full-size and appear gravid. Hopefully, they will lay without difficulty. Luckily, the male I already had is full-size and can match up with the females for breeding when the time comes. I am interested in maintaining a breeding group of these.
I have kept other pygmy species, but don't have long-term experience with acuminatus. I have them set up in three small, well-planted vivaria, with an ultra-sonic fogger which comes on several times per day, and I mist morning and night. So far, they are active, not shy at all, and have good appetites. They clearly are humidity-loving and respond well to misting and fog. The males can show robin's egg blue, which is really beautiful.