You were right on - just got home to find the Raphs have settled into new hiding places. The pictus are still *not* hiding, which makes me think that they didn't like something about the 29g. I kind of feel bad for not picking up on it, but they survived and I think they're happy now.I'd say this is strange for the raphs if there are available hideouts and they are in the open. Id guess they are stressed (by water? because if it was light or bullying they'd hide). Give it some time and see if they calm down?
Pictuses are not hiders when comfortable. Nigriventris are hiders but will come out a lot more than raphs.
Algae and presence or absence of live plants shouldnt matter to their comfort.
The nigriventris have settled a bit, but still, even with the lights on, if I sit still and don't spook them, they'll occasionally come down to where the pictus are, almost like they're trying to shoal with them. Nigriventris being what they are, I have to assume that, whatever is happening with them, they're not unhappy - if they were scared or upset they'd hide *more*.