Ahhh great!
Thanks for the confirmation. I will chain them.
The description of the Ultitube does not show that it allows to chain the RGBpx, hence my question.
I should have checked the description of the ring itself (which I just did), where we can see the two connectors.
Well on a side note, I wouldn't mind losing individual control, I don't really like Christmas tree styles...
My intention is to just have a soft, uniform lighting. But if I can keep the individual control, I might as well keep it, in case one day I get the Christmas disease
Merry Christmas to you (a bit late

)