They are very pretty and look nice and healthy and happy. I would not do anything at all while they are blooming. They do not look too crowded, so if you just wanted a different pot, make it the same size as what they are in, but wait until they finished blooming, also if you repot, make sure you use soil that has good drainage (and pot has a hole in bottom for drainage)Clay pots work best for
cactus, but you can use any pot you like.
cactus like smaller areas, and about watering...Everyone will have a different opinion on this, But here is mine: Someone once ask me how often does it rain in the desert? Well that is how often you need to water
cactus. I water mine about once a month and alot of times it is two months before I water, during the winter or cold months I don't water at all. Your
cactus will need some sun to remain healthy...a window sill that offers some sun will work, if your winter is cold, be sure there are no cold drafts where your
cactus are...Most
cactus do not like the cold....The fastest way to kill your
cactus is from too much water. They can live for a year without water, but it is not a good idea to do that. About fertilizing them...I do not fertilize mine, but I am sure someone else can advise you about doing that, right now I would do nothing until they finish blooming.