r/Astrophytum

Had this guy for about 6 months now. This is the first flower it’s had in my care and looks like a second is on the way!

Any help is greatly appreciated and any identification guides are even better, thanks!

My astrophytum has multiple flower buds per aerole (the only way I cam describe it), is this normal or at least not a sign of disease (witch broom)? It is grafted on myrtle cactus and the pictures are a few days apart.