I'd keep the 5lpm as a spare/backup and go to one 15 rather than running 2 machines. At least, that's what I did, and am happy with the decision. Less noise and less space taken up by one machine vs two...
Haven't worked on a cricket, though; I use either a mini CC or a mega minor. You might want to check the manufacturer's specs for the cricket and see if there is any guidance there.
Mimi
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