Well, I've decided to try cypress mulch instead of gambling on the added air holes being enough for the sphagnum moss. If this bedding works out better, I'll look into finding an equivalent bedding without the environmental impacts, and use that while they are in their tub set ups.
Morzan is still in a snappy mood. The food bulge is much smaller now, but still present, and he was slightly less inclined to bite. I was able to take him out of his tub without protest, but when I removed him from his holding container to put him in his tub, he nailed me right on the thumb. lol He wouldn't let me pick him up, and I didn't want to irritate and stress him by chasing his coils around the Tupperware, so I just dumped him gently onto his bed of moss. He landed on his back, but quickly flipped over to posture at me in a striking position. He wouldn't strike with the camera aimed at him, but he put in a few more swings when I put the camera away to replace the tub's top.
Homura also took another swing at me today, this time it's because she fell off her favorite perch when I lifted up the top of the tub. She fell on her back, and she was clenching her stomach muscles so tightly it looked like a lung had imploded. >.> I reach for her and she snapped at me, but didn't land, and after that she calmed down and I picked her up. After she relaxed, her stomach went to normal. Poor girl was very startled, though. I did the same thing to Nymeria earlier this week, too, but she didn't strike, just wrinkled the back of her head and sat there with dilated pupils.
So it looks like Morzan is living up to the nippy reputation of baby rainbows, and although Homura is a bit more inclined to strike out than Sanji ever was, I don't really feel she's all that snappy.