Just give them a bit more room by doing a re-pot. Then let them grow and make a huge pot of cactus. I love to leave the babies on, but you can take them off and pot them separately. They look really good.
Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
Your cactus are Echinopsis, from the growth habit maybe Echinopsis eyriesii.
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