Very healthy plants that you have there
Alfonso

I know I'm some kind of melo-heathen, but they all look the same to me. How do you tell them apart?

Nice ones Michelle! you'll certainly see some difference in a few years, and particularly when they begin to produce their cephaliums.

CP

Dear Michelle,

I'm sorry I haven't much to contribute other than:

1) They're very nicely grown - good on ya!

2) I don't know much about Melos, but at the young stage that they're at it's difficult to ID them - wait another few years, as CP observed, and the IDs will be much easier (and more accurate).

Thanks

A gallery of Melocactus species in cultivation ....

http://jp29.org/cegal.htm#Melocactus